2121021011021 has 16 divisors (see below), whose sum is σ = 2473331753088. Its totient is φ = 1799381548800.

The previous prime is 2121021010967. The next prime is 2121021011041. The reversal of 2121021011021 is 1201101201212.

It is a de Polignac number, because none of the positive numbers 2^k-2121021011021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121021010987 and 2121021011005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121021011041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102227216 + ... + 102247961.

It is an arithmetic number, because the mean of its divisors is an integer number (154583234568).

Almost surely, 2^{2121021011021} is an apocalyptic number.

It is an amenable number.

2121021011021 is a deficient number, since it is larger than the sum of its proper divisors (352310742067).

2121021011021 is a wasteful number, since it uses less digits than its factorization.

2121021011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204475252.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2121021011021 its reverse (1201101201212), we get a palindrome (3322122212233).

The spelling of 2121021011021 in words is "two trillion, one hundred twenty-one billion, twenty-one million, eleven thousand, twenty-one".