211996521 has 40 divisors (see below), whose sum is σ = 347318400. Its totient is φ = 127798560.

The previous prime is 211996513. The next prime is 211996529. The reversal of 211996521 is 125699112.

It is an interprime number because it is at equal distance from previous prime (211996513) and next prime (211996529).

It is not a de Polignac number, because 211996521 - 2³ = 211996513 is a prime.

It is a super-2 number, since 2×211996521² = 89885049832206882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211996529) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 203520 + ... + 204558.

It is an arithmetic number, because the mean of its divisors is an integer number (8682960).

Almost surely, 2^211996521 is an apocalyptic number.

It is an amenable number.

211996521 is a deficient number, since it is larger than the sum of its proper divisors (135321879).

211996521 is a wasteful number, since it uses less digits than its factorization.

211996521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291 (or 1282 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 211996521 is about 14560.1003087204. The cubic root of 211996521 is about 596.2699340671.

The spelling of 211996521 in words is "two hundred eleven million, nine hundred ninety-six thousand, five hundred twenty-one".