21010102212021 has 64 divisors (see below), whose sum is σ = 32026052717568. Its totient is φ = 12137115230208.

The previous prime is 21010102211977. The next prime is 21010102212107. The reversal of 21010102212021 is 12021220101012.

It is not a de Polignac number, because 21010102212021 - 2¹⁷ = 21010102080949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010102214021) 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, 811093956 + ... + 811119858.

It is an arithmetic number, because the mean of its divisors is an integer number (500407073712).

Almost surely, 2^{21010102212021} is an apocalyptic number.

It is an amenable number.

21010102212021 is a deficient number, since it is larger than the sum of its proper divisors (11015950505547).

21010102212021 is a wasteful number, since it uses less digits than its factorization.

21010102212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29070.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21010102212021 its reverse (12021220101012), we get a palindrome (33031322313033).

The spelling of 21010102212021 in words is "twenty-one trillion, ten billion, one hundred two million, two hundred twelve thousand, twenty-one".