212153638 has 4 divisors (see below), whose sum is σ = 318230460. Its totient is φ = 106076818.

The previous prime is 212153621. The next prime is 212153651. The reversal of 212153638 is 836351212.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×212153638² = 90018332233270088, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 53038408 + ... + 53038411.

It is an arithmetic number, because the mean of its divisors is an integer number (79557615).

Almost surely, 2^212153638 is an apocalyptic number.

212153638 is a deficient number, since it is larger than the sum of its proper divisors (106076822).

212153638 is a wasteful number, since it uses less digits than its factorization.

212153638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106076821.

The product of its digits is 8640, while the sum is 31.

The square root of 212153638 is about 14565.4947736079. The cubic root of 212153638 is about 596.4172022208.

The spelling of 212153638 in words is "two hundred twelve million, one hundred fifty-three thousand, six hundred thirty-eight".