21012121121101 has 8 divisors (see below), whose sum is σ = 22922705812608. Its totient is φ = 19101601740000.

The previous prime is 21012121121077. The next prime is 21012121121111. The reversal of 21012121121101 is 10112112121012.

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

It is a cyclic number.

It is not a de Polignac number, because 21012121121101 - 2⁷ = 21012121120973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012121121111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15653685 + ... + 16942906.

It is an arithmetic number, because the mean of its divisors is an integer number (2865338226576).

Almost surely, 2^{21012121121101} is an apocalyptic number.

It is an amenable number.

21012121121101 is a deficient number, since it is larger than the sum of its proper divisors (1910584691507).

21012121121101 is a wasteful number, since it uses less digits than its factorization.

21012121121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32655203.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21012121121101 its reverse (10112112121012), we get a palindrome (31124233242113).

The spelling of 21012121121101 in words is "twenty-one trillion, twelve billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred one".