212061638 has 32 divisors (see below), whose sum is σ = 355829760. Its totient is φ = 94308480.

The previous prime is 212061623. The next prime is 212061643. The reversal of 212061638 is 836160212.

It is a super-2 number, since 2×212061638² = 89940276622486088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212061638.

It is a congruent number.

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, 42983 + ... + 47661.

It is an arithmetic number, because the mean of its divisors is an integer number (11119680).

Almost surely, 2^212061638 is an apocalyptic number.

212061638 is a deficient number, since it is larger than the sum of its proper divisors (143768122).

212061638 is a wasteful number, since it uses less digits than its factorization.

212061638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4772.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 212061638 is about 14562.3362823415. The cubic root of 212061638 is about 596.3309780478.

The spelling of 212061638 in words is "two hundred twelve million, sixty-one thousand, six hundred thirty-eight".