2121010110021 has 16 divisors (see below), whose sum is σ = 3087917978688. Its totient is φ = 1284288854400.

The previous prime is 2121010109989. The next prime is 2121010110049. The reversal of 2121010110021 is 1200110101212.

It is not a de Polignac number, because 2121010110021 - 2⁵ = 2121010109989 is a prime.

It is a super-2 number, since 2×2121010110021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121010109979 and 2121010110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121010110061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29258710 + ... + 29331111.

It is an arithmetic number, because the mean of its divisors is an integer number (192994873668).

Almost surely, 2^{2121010110021} is an apocalyptic number.

It is an amenable number.

2121010110021 is a deficient number, since it is larger than the sum of its proper divisors (966907868667).

2121010110021 is a wasteful number, since it uses less digits than its factorization.

2121010110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58590932.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 2121010110021 its reverse (1200110101212), we get a palindrome (3321120211233).

The spelling of 2121010110021 in words is "two trillion, one hundred twenty-one billion, ten million, one hundred ten thousand, twenty-one".