21132965 has 12 divisors (see below), whose sum is σ = 29500236. Its totient is φ = 14491008.

The previous prime is 21132953. The next prime is 21132983. The reversal of 21132965 is 56923112.

It can be written as a sum of positive squares in 2 ways, for example, as 2660161 + 18472804 = 1631^2 + 4298^2 .

It is not a de Polignac number, because 21132965 - 2⁴ = 21132949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42884 + ... + 43373.

It is an arithmetic number, because the mean of its divisors is an integer number (2458353).

Almost surely, 2^21132965 is an apocalyptic number.

It is an amenable number.

21132965 is a deficient number, since it is larger than the sum of its proper divisors (8367271).

21132965 is an equidigital number, since it uses as much as digits as its factorization.

21132965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86276 (or 86269 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 21132965 is about 4597.0604738246. The cubic root of 21132965 is about 276.4734792701.

The spelling of 21132965 in words is "twenty-one million, one hundred thirty-two thousand, nine hundred sixty-five".