210021022100021 has 16 divisors (see below), whose sum is σ = 230149645617600. Its totient is φ = 190065288316800.

The previous prime is 210021022099957. The next prime is 210021022100039. The reversal of 210021022100021 is 120001220120012.

It is a cyclic number.

It is not a de Polignac number, because 210021022100021 - 2⁶ = 210021022099957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021022099969 and 210021022100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021022100621) 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, 10033610 + ... + 22819188.

It is an arithmetic number, because the mean of its divisors is an integer number (14384352851100).

Almost surely, 2^{210021022100021} is an apocalyptic number.

It is an amenable number.

210021022100021 is a deficient number, since it is larger than the sum of its proper divisors (20128623517579).

210021022100021 is a wasteful number, since it uses less digits than its factorization.

210021022100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12792340.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210021022100021 its reverse (120001220120012), we get a palindrome (330022242220033).

The spelling of 210021022100021 in words is "two hundred ten trillion, twenty-one billion, twenty-two million, one hundred thousand, twenty-one".