212551240 has 32 divisors (see below), whose sum is σ = 521717760. Its totient is φ = 77291200.

The previous prime is 212551231. The next prime is 212551243. The reversal of 212551240 is 42155212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (212551243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241096 + ... + 241975.

It is an arithmetic number, because the mean of its divisors is an integer number (16303680).

Almost surely, 2^212551240 is an apocalyptic number.

212551240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212551240 is an abundant number, since it is smaller than the sum of its proper divisors (309166520).

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

212551240 is a wasteful number, since it uses less digits than its factorization.

212551240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483093 (or 483089 counting only the distinct ones).

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

The square root of 212551240 is about 14579.1371486793. The cubic root of 212551240 is about 596.7895560923.

The spelling of 212551240 in words is "two hundred twelve million, five hundred fifty-one thousand, two hundred forty".