21514531 has 2 divisors, whose sum is σ = 21514532. Its totient is φ = 21514530.

The previous prime is 21514483. The next prime is 21514543. The reversal of 21514531 is 13541512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21514531 - 2⁹ = 21514019 is a prime.

It is a super-2 number, since 2×21514531² = 925750088299922, which contains 22 as substring.

It is equal to p_1360444 and since 21514531 and 1360444 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21514931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757265 + 10757266.

It is an arithmetic number, because the mean of its divisors is an integer number (10757266).

Almost surely, 2^21514531 is an apocalyptic number.

21514531 is a deficient number, since it is larger than the sum of its proper divisors (1).

21514531 is an equidigital number, since it uses as much as digits as its factorization.

21514531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 600, while the sum is 22.

The square root of 21514531 is about 4638.3759011102. The cubic root of 21514531 is about 278.1275185733.

The spelling of 21514531 in words is "twenty-one million, five hundred fourteen thousand, five hundred thirty-one".