20121010101021 has 16 divisors (see below), whose sum is σ = 26877499133760. Its totient is φ = 13389286391040.

The previous prime is 20121010101019. The next prime is 20121010101121. The reversal of 20121010101021 is 12010101012102.

It is not a de Polignac number, because 20121010101021 - 2¹ = 20121010101019 is a prime.

It is a super-2 number, since 2×20121010101021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20121010100988 and 20121010101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121010101121) 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, 769941 + ... + 6390213.

It is an arithmetic number, because the mean of its divisors is an integer number (1679843695860).

Almost surely, 2^{20121010101021} is an apocalyptic number.

It is an amenable number.

20121010101021 is a deficient number, since it is larger than the sum of its proper divisors (6756489032739).

20121010101021 is a wasteful number, since it uses less digits than its factorization.

20121010101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5622476.

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

Adding to 20121010101021 its reverse (12010101012102), we get a palindrome (32131111113123).

The spelling of 20121010101021 in words is "twenty trillion, one hundred twenty-one billion, ten million, one hundred one thousand, twenty-one".