21486051 has 12 divisors (see below), whose sum is σ = 31127928. Its totient is φ = 14281344.

The previous prime is 21486043. The next prime is 21486067. The reversal of 21486051 is 15068412.

It is not a de Polignac number, because 21486051 - 2³ = 21486043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21486001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205 + ... + 6558.

It is an arithmetic number, because the mean of its divisors is an integer number (2593994).

Almost surely, 2^21486051 is an apocalyptic number.

21486051 is a deficient number, since it is larger than the sum of its proper divisors (9641877).

21486051 is a wasteful number, since it uses less digits than its factorization.

21486051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7122 (or 7119 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 21486051 is about 4635.3048443441. The cubic root of 21486051 is about 278.0047400120.

The spelling of 21486051 in words is "twenty-one million, four hundred eighty-six thousand, fifty-one".