212157056 has 64 divisors (see below), whose sum is σ = 440770560. Its totient is φ = 101606400.

The previous prime is 212156981. The next prime is 212157079. The reversal of 212157056 is 650751212.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503726 + ... + 504146.

It is an arithmetic number, because the mean of its divisors is an integer number (6887040).

Almost surely, 2^212157056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212157056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220385280).

212157056 is an abundant number, since it is smaller than the sum of its proper divisors (228613504).

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

212157056 is a wasteful number, since it uses less digits than its factorization.

212157056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 212157056 is about 14565.6121052292. The cubic root of 212157056 is about 596.4204051560.

The spelling of 212157056 in words is "two hundred twelve million, one hundred fifty-seven thousand, fifty-six".