212502205000021 has 4 divisors (see below), whose sum is σ = 212502236308992. Its totient is φ = 212502173691052.

The previous prime is 212502204999941. The next prime is 212502205000087. The reversal of 212502205000021 is 120000502205212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212502205000021 - 2⁷ = 212502204999893 is a prime.

It is a super-2 number, since 2×212502205000021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212502204999956 and 212502205000001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212502205000121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 732055 + ... + 20628628.

It is an arithmetic number, because the mean of its divisors is an integer number (53125559077248).

Almost surely, 2^{212502205000021} is an apocalyptic number.

It is an amenable number.

212502205000021 is a deficient number, since it is larger than the sum of its proper divisors (31308971).

212502205000021 is an equidigital number, since it uses as much as digits as its factorization.

212502205000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31308970.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 212502205000021 its reverse (120000502205212), we get a palindrome (332502707205233).

The spelling of 212502205000021 in words is "two hundred twelve trillion, five hundred two billion, two hundred five million, twenty-one", and thus it is an aban number.