212139973440 has 168 divisors, whose sum is σ = 768077163360. Its totient is φ = 53593242624.

The previous prime is 212139973417. The next prime is 212139973499. The reversal of 212139973440 is 44379931212.

212139973440 is a `hidden beast` number, since 2 + 1 + 2 + 139 + 9 + 73 + 440 = 666.

It is a super-2 number, since 2×212139973440² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1883694 + ... + 1993133.

Almost surely, 2^212139973440 is an apocalyptic number.

212139973440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212139973440 is an abundant number, since it is smaller than the sum of its proper divisors (555937189920).

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

212139973440 is a wasteful number, since it uses less digits than its factorization.

212139973440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3876869 (or 3876856 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 212139973440 in words is "two hundred twelve billion, one hundred thirty-nine million, nine hundred seventy-three thousand, four hundred forty".