212049981 has 40 divisors (see below), whose sum is σ = 372165024. Its totient is φ = 118622880.

The previous prime is 212049973. The next prime is 212049989. The reversal of 212049981 is 189940212.

It is an interprime number because it is at equal distance from previous prime (212049973) and next prime (212049989).

It is not a de Polignac number, because 212049981 - 2³ = 212049973 is a prime.

It is a super-2 number, since 2×212049981² = 89930388884200722, which contains 22 as substring.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212049989) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 2430 + ... + 20736.

Almost surely, 2^212049981 is an apocalyptic number.

It is an amenable number.

212049981 is a deficient number, since it is larger than the sum of its proper divisors (160115043).

212049981 is a wasteful number, since it uses less digits than its factorization.

212049981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18343 (or 18334 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 212049981 is about 14561.9360319979. The cubic root of 212049981 is about 596.3200511027.

The spelling of 212049981 in words is "two hundred twelve million, forty-nine thousand, nine hundred eighty-one".