212251640 has 32 divisors (see below), whose sum is σ = 480742560. Its totient is φ = 84336000.

The previous prime is 212251639. The next prime is 212251643. The reversal of 212251640 is 46152212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212251643) 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, 11531 + ... + 23610.

It is an arithmetic number, because the mean of its divisors is an integer number (15023205).

Almost surely, 2^212251640 is an apocalyptic number.

212251640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212251640 is an abundant number, since it is smaller than the sum of its proper divisors (268490920).

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

212251640 is a wasteful number, since it uses less digits than its factorization.

212251640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35303 (or 35299 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 212251640 is about 14568.8585688790. The cubic root of 212251640 is about 596.5090241687.

The spelling of 212251640 in words is "two hundred twelve million, two hundred fifty-one thousand, six hundred forty".