21274154 has 16 divisors (see below), whose sum is σ = 34947936. Its totient is φ = 9632400.

The previous prime is 21274133. The next prime is 21274159. The reversal of 21274154 is 45147212.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4349 + ... + 7839.

It is an arithmetic number, because the mean of its divisors is an integer number (2184246).

Almost surely, 2^21274154 is an apocalyptic number.

21274154 is a deficient number, since it is larger than the sum of its proper divisors (13673782).

21274154 is a wasteful number, since it uses less digits than its factorization.

21274154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3781.

The product of its digits is 2240, while the sum is 26.

The square root of 21274154 is about 4612.3913537340. The cubic root of 21274154 is about 277.0878181245.

The spelling of 21274154 in words is "twenty-one million, two hundred seventy-four thousand, one hundred fifty-four".