212155404 has 48 divisors (see below), whose sum is σ = 517816320. Its totient is φ = 67478400.

The previous prime is 212155357. The next prime is 212155429. The reversal of 212155404 is 404551212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165237 + ... + 166515.

It is an arithmetic number, because the mean of its divisors is an integer number (10787840).

Almost surely, 2^212155404 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 212155404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258908160).

212155404 is an abundant number, since it is smaller than the sum of its proper divisors (305660916).

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

212155404 is a wasteful number, since it uses less digits than its factorization.

212155404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910 (or 1908 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 212155404 is about 14565.5553962079. Note that the first 3 decimals coincide. The cubic root of 212155404 is about 596.4188571062.

The spelling of 212155404 in words is "two hundred twelve million, one hundred fifty-five thousand, four hundred four".