21132953 has 2 divisors, whose sum is σ = 21132954. Its totient is φ = 21132952.

The previous prime is 21132949. The next prime is 21132983. The reversal of 21132953 is 35923112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12054784 + 9078169 = 3472^2 + 3013^2 .

It is a cyclic number.

It is not a de Polignac number, because 21132953 - 2² = 21132949 is a prime.

It is not a weakly prime, because it can be changed into another prime (21132983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566476 + 10566477.

It is an arithmetic number, because the mean of its divisors is an integer number (10566477).

Almost surely, 2^21132953 is an apocalyptic number.

It is an amenable number.

21132953 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132953 is an equidigital number, since it uses as much as digits as its factorization.

21132953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 26.

The square root of 21132953 is about 4597.0591686425. The cubic root of 21132953 is about 276.4734269398.

The spelling of 21132953 in words is "twenty-one million, one hundred thirty-two thousand, nine hundred fifty-three".