21274151 has 6 divisors (see below), whose sum is σ = 21459240. Its totient is φ = 21090636.

The previous prime is 21274133. The next prime is 21274159. The reversal of 21274151 is 15147212.

It is not a de Polignac number, because 21274151 - 2¹⁰ = 21273127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21274159) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15470 + ... + 16788.

It is an arithmetic number, because the mean of its divisors is an integer number (3576540).

Almost surely, 2^21274151 is an apocalyptic number.

21274151 is a deficient number, since it is larger than the sum of its proper divisors (185089).

21274151 is an equidigital number, since it uses as much as digits as its factorization.

21274151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573 (or 1446 counting only the distinct ones).

The product of its digits is 560, while the sum is 23.

The square root of 21274151 is about 4612.3910285231. The cubic root of 21274151 is about 277.0878050999.

The spelling of 21274151 in words is "twenty-one million, two hundred seventy-four thousand, one hundred fifty-one".