212717720280 has 128 divisors (see below), whose sum is σ = 704004073920. Its totient is φ = 51084165120.

The previous prime is 212717720269. The next prime is 212717720297. The reversal of 212717720280 is 82027717212.

It is a super-2 number, since 2×212717720280² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1598937 + ... + 1726856.

Almost surely, 2^212717720280 is an apocalyptic number.

212717720280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212717720280 is an abundant number, since it is smaller than the sum of its proper divisors (491286353640).

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

212717720280 is a wasteful number, since it uses less digits than its factorization.

212717720280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325861 (or 3325857 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 39.

The spelling of 212717720280 in words is "two hundred twelve billion, seven hundred seventeen million, seven hundred twenty thousand, two hundred eighty".