212239720 has 64 divisors (see below), whose sum is σ = 595382400. Its totient is φ = 66151680.

The previous prime is 212239717. The next prime is 212239721. The reversal of 212239720 is 27932212.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (212239721) 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, 31375 + ... + 37534.

It is an arithmetic number, because the mean of its divisors is an integer number (9302850).

Almost surely, 2^212239720 is an apocalyptic number.

212239720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212239720 is an abundant number, since it is smaller than the sum of its proper divisors (383142680).

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

212239720 is a wasteful number, since it uses less digits than its factorization.

212239720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68938 (or 68934 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 212239720 is about 14568.4494713748. The cubic root of 212239720 is about 596.4978573595.

It can be divided in two parts, 212 and 239720, that added together give a palindrome (239932).

The spelling of 212239720 in words is "two hundred twelve million, two hundred thirty-nine thousand, seven hundred twenty".