212052981 has 16 divisors (see below), whose sum is σ = 323552768. Its totient is φ = 121014000.

The previous prime is 212052941. The next prime is 212052991. The reversal of 212052981 is 189250212.

It is not a de Polignac number, because 212052981 - 2⁹ = 212052469 is a prime.

It is a super-2 number, since 2×212052981² = 89932933501972722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212052941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10806 + ... + 23256.

It is an arithmetic number, because the mean of its divisors is an integer number (20222048).

Almost surely, 2^212052981 is an apocalyptic number.

212052981 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212052981 is a deficient number, since it is larger than the sum of its proper divisors (111499787).

212052981 is a wasteful number, since it uses less digits than its factorization.

212052981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13272.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 212052981 is about 14562.0390399147. The cubic root of 212052981 is about 596.3228632569.

The spelling of 212052981 in words is "two hundred twelve million, fifty-two thousand, nine hundred eighty-one".