21012010111121 has 8 divisors (see below), whose sum is σ = 21130890711744. Its totient is φ = 20893424867280.

The previous prime is 21012010111117. The next prime is 21012010111123. The reversal of 21012010111121 is 12111101021012.

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 21012010111121 - 2² = 21012010111117 is a prime.

It is a super-2 number, since 2×21012010111121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21012010111096 and 21012010111105.

It is not an unprimeable number, because it can be changed into a prime (21012010111123) 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, 73696511 + ... + 73981076.

It is an arithmetic number, because the mean of its divisors is an integer number (2641361338968).

Almost surely, 2^{21012010111121} is an apocalyptic number.

It is an amenable number.

21012010111121 is a deficient number, since it is larger than the sum of its proper divisors (118880600623).

21012010111121 is a wasteful number, since it uses less digits than its factorization.

21012010111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147678391.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21012010111121 its reverse (12111101021012), we get a palindrome (33123111132133).

The spelling of 21012010111121 in words is "twenty-one trillion, twelve billion, ten million, one hundred eleven thousand, one hundred twenty-one".