20101210101021 has 64 divisors (see below), whose sum is σ = 31978444636160. Its totient is φ = 10989777876480.

The previous prime is 20101210101019. The next prime is 20101210101067. The reversal of 20101210101021 is 12010101210102.

It is not a de Polignac number, because 20101210101021 - 2¹ = 20101210101019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101210100988 and 20101210101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101210101121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 32118330 + ... + 32738196.

It is an arithmetic number, because the mean of its divisors is an integer number (499663197440).

Almost surely, 2^{20101210101021} is an apocalyptic number.

20101210101021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20101210101021 is a deficient number, since it is larger than the sum of its proper divisors (11877234535139).

20101210101021 is a wasteful number, since it uses less digits than its factorization.

20101210101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620474.

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

Adding to 20101210101021 its reverse (12010101210102), we get a palindrome (32111311311123).

The spelling of 20101210101021 in words is "twenty trillion, one hundred one billion, two hundred ten million, one hundred one thousand, twenty-one".