21010010212021 has 16 divisors (see below), whose sum is σ = 22190124605760. Its totient is φ = 19837435403520.

The previous prime is 21010010212003. The next prime is 21010010212049. The reversal of 21010010212021 is 12021201001012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010010212021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010010211992 and 21010010212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010010282021) 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, 5574525 + ... + 8549581.

It is an arithmetic number, because the mean of its divisors is an integer number (1386882787860).

Almost surely, 2^{21010010212021} is an apocalyptic number.

It is an amenable number.

21010010212021 is a deficient number, since it is larger than the sum of its proper divisors (1180114393739).

21010010212021 is a wasteful number, since it uses less digits than its factorization.

21010010212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976324.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21010010212021 its reverse (12021201001012), we get a palindrome (33031211213033).

The spelling of 21010010212021 in words is "twenty-one trillion, ten billion, ten million, two hundred twelve thousand, twenty-one".