212201000100021 has 32 divisors (see below), whose sum is σ = 289982108021760. Its totient is φ = 137947116339200.

The previous prime is 212201000099989. The next prime is 212201000100041. The reversal of 212201000100021 is 120001000102212.

It is a cyclic number.

It is not a de Polignac number, because 212201000100021 - 2⁵ = 212201000099989 is a prime.

It is a super-2 number, since 2×212201000100021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212201000100041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3018943645 + ... + 3019013933.

It is an arithmetic number, because the mean of its divisors is an integer number (9061940875680).

Almost surely, 2^{212201000100021} is an apocalyptic number.

It is an amenable number.

212201000100021 is a deficient number, since it is larger than the sum of its proper divisors (77781107921739).

212201000100021 is a wasteful number, since it uses less digits than its factorization.

212201000100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82397.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 212201000100021 its reverse (120001000102212), we get a palindrome (332202000202233).

The spelling of 212201000100021 in words is "two hundred twelve trillion, two hundred one billion, one hundred thousand, twenty-one".