21249016011 has 20 divisors (see below), whose sum is σ = 31746623832. Its totient is φ = 14164106688.

The previous prime is 21249015971. The next prime is 21249016093. The reversal of 21249016011 is 11061094212.

21249016011 is a `hidden beast` number, since 2 + 1 + 2 + 490 + 160 + 11 = 666.

It is not a de Polignac number, because 21249016011 - 2⁶ = 21249015947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21249016511) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 851731 + ... + 876323.

Almost surely, 2^21249016011 is an apocalyptic number.

21249016011 is a deficient number, since it is larger than the sum of its proper divisors (10497607821).

21249016011 is a wasteful number, since it uses less digits than its factorization.

21249016011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35272 (or 35263 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The spelling of 21249016011 in words is "twenty-one billion, two hundred forty-nine million, sixteen thousand, eleven".