212161642 has 24 divisors (see below), whose sum is σ = 399778848. Its totient is φ = 82659720.

The previous prime is 212161627. The next prime is 212161669. The reversal of 212161642 is 246161212.

It is a happy number.

It is a super-2 number, since 2×212161642² = 90025124672272328, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 60928 + ... + 64315.

It is an arithmetic number, because the mean of its divisors is an integer number (16657452).

Almost surely, 2^212161642 is an apocalyptic number.

212161642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

212161642 is a deficient number, since it is larger than the sum of its proper divisors (187617206).

212161642 is a wasteful number, since it uses less digits than its factorization.

212161642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125274 (or 125263 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 212161642 is about 14565.7695299630. The cubic root of 212161642 is about 596.4247025451.

The spelling of 212161642 in words is "two hundred twelve million, one hundred sixty-one thousand, six hundred forty-two".