212705371520 has 64 divisors (see below), whose sum is σ = 510477768000. Its totient is φ = 84751024128.

The previous prime is 212705371429. The next prime is 212705371537. The reversal of 212705371520 is 25173507212.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×212705371520² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482120 + ... + 811079.

It is an arithmetic number, because the mean of its divisors is an integer number (7976215125).

Almost surely, 2^212705371520 is an apocalyptic number.

212705371520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212705371520 is an abundant number, since it is smaller than the sum of its proper divisors (297772396480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212705371520 is a wasteful number, since it uses less digits than its factorization.

212705371520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293475 (or 1293463 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 35.

Adding to 212705371520 its reverse (25173507212), we get a palindrome (237878878732).

The spelling of 212705371520 in words is "two hundred twelve billion, seven hundred five million, three hundred seventy-one thousand, five hundred twenty".