212158989 has 12 divisors (see below), whose sum is σ = 350230816. Its totient is φ = 121233672.

The previous prime is 212158981. The next prime is 212159011. The reversal of 212158989 is 989851212.

It is not a de Polignac number, because 212158989 - 2³ = 212158981 is a prime.

It is a super-2 number, since 2×212158989² = 90022873227004242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212158981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1683739 + ... + 1683864.

Almost surely, 2^212158989 is an apocalyptic number.

It is an amenable number.

212158989 is a deficient number, since it is larger than the sum of its proper divisors (138071827).

212158989 is a wasteful number, since it uses less digits than its factorization.

212158989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3367616 (or 3367613 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 212158989 is about 14565.6784599963. The cubic root of 212158989 is about 596.4222165140.

It can be divided in two parts, 212 and 158989, that added together give a square (159201 = 399²).

The spelling of 212158989 in words is "two hundred twelve million, one hundred fifty-eight thousand, nine hundred eighty-nine".