212051220 has 24 divisors (see below), whose sum is σ = 593743584. Its totient is φ = 56546976.

The previous prime is 212051173. The next prime is 212051233. The reversal of 212051220 is 22150212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 212051220.

It is a congruent number.

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, 1767034 + ... + 1767153.

It is an arithmetic number, because the mean of its divisors is an integer number (24739316).

Almost surely, 2^212051220 is an apocalyptic number.

212051220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212051220 is an abundant number, since it is smaller than the sum of its proper divisors (381692364).

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

212051220 is a wasteful number, since it uses less digits than its factorization.

212051220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3534199 (or 3534197 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 212051220 is about 14561.9785743559. The cubic root of 212051220 is about 596.3212125256.

The spelling of 212051220 in words is "two hundred twelve million, fifty-one thousand, two hundred twenty".