210122121222111 has 8 divisors (see below), whose sum is σ = 320186089481344. Its totient is φ = 120069783555480.

The previous prime is 210122121222029. The next prime is 210122121222131. The reversal of 210122121222111 is 111222121221012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 210122121222111 - 2³⁰ = 210121047480287 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 10005815296291 = 210122121222111 / (2 + 1 + 0 + 1 + 2 + 2 + 1 + 2 + 1 + 2 + 2 + 2 + 1 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210122121222131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5002907648125 + ... + 5002907648166.

It is an arithmetic number, because the mean of its divisors is an integer number (40023261185168).

Almost surely, 2^{210122121222111} is an apocalyptic number.

210122121222111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

210122121222111 is a deficient number, since it is larger than the sum of its proper divisors (110063968259233).

210122121222111 is a wasteful number, since it uses less digits than its factorization.

210122121222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10005815296301.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 210122121222111 its reverse (111222121221012), we get a palindrome (321344242443123).

The spelling of 210122121222111 in words is "two hundred ten trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".