210991012 has 12 divisors (see below), whose sum is σ = 390954060. Its totient is φ = 99289856.

The previous prime is 210991007. The next prime is 210991049. The reversal of 210991012 is 210199012.

It can be written as a sum of positive squares in 2 ways, for example, as 66846976 + 144144036 = 8176^2 + 12006^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1551337 + ... + 1551472.

It is an arithmetic number, because the mean of its divisors is an integer number (32579505).

Almost surely, 2^210991012 is an apocalyptic number.

It is an amenable number.

210991012 is a deficient number, since it is larger than the sum of its proper divisors (179963048).

210991012 is a wasteful number, since it uses less digits than its factorization.

210991012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3102830 (or 3102828 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 210991012 is about 14525.5296633204. The cubic root of 210991012 is about 595.3257280128.

The spelling of 210991012 in words is "two hundred ten million, nine hundred ninety-one thousand, twelve".