212161650 has 48 divisors (see below), whose sum is σ = 536108544. Its totient is φ = 55506880.

The previous prime is 212161627. The next prime is 212161669. The reversal of 212161650 is 56161212.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 212161650.

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 23 ways as a sum of consecutive naturals, for example, 5394 + ... + 21293.

It is an arithmetic number, because the mean of its divisors is an integer number (11168928).

Almost surely, 2^212161650 is an apocalyptic number.

212161650 is an abundant number, since it is smaller than the sum of its proper divisors (323946894).

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

212161650 is a wasteful number, since it uses less digits than its factorization.

212161650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26755 (or 26750 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 212161650 is about 14565.7698045795. The cubic root of 212161650 is about 596.4247100416.

The spelling of 212161650 in words is "two hundred twelve million, one hundred sixty-one thousand, six hundred fifty".