212911900 has 18 divisors (see below), whose sum is σ = 462019040. Its totient is φ = 85164720.

The previous prime is 212911879. The next prime is 212911957. The reversal of 212911900 is 9119212.

It is a super-2 number, since 2×212911900² = 90662954323220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1064460 + ... + 1064659.

Almost surely, 2^212911900 is an apocalyptic number.

212911900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212911900 is an abundant number, since it is smaller than the sum of its proper divisors (249107140).

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

212911900 is a wasteful number, since it uses less digits than its factorization.

212911900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129133 (or 2129126 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 212911900 is about 14591.5009508960. The cubic root of 212911900 is about 597.1269123869.

The spelling of 212911900 in words is "two hundred twelve million, nine hundred eleven thousand, nine hundred".