21274941 has 16 divisors (see below), whose sum is σ = 29211840. Its totient is φ = 13764480.

The previous prime is 21274933. The next prime is 21274949. The reversal of 21274941 is 14947212.

It is an interprime number because it is at equal distance from previous prime (21274933) and next prime (21274949).

It is not a de Polignac number, because 21274941 - 2³ = 21274933 is a prime.

It is a super-2 number, since 2×21274941² = 905246229106962, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21274899 and 21274908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21274949) 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 15 ways as a sum of consecutive naturals, for example, 32766 + ... + 33408.

It is an arithmetic number, because the mean of its divisors is an integer number (1825740).

Almost surely, 2^21274941 is an apocalyptic number.

It is an amenable number.

21274941 is a deficient number, since it is larger than the sum of its proper divisors (7936899).

21274941 is a wasteful number, since it uses less digits than its factorization.

21274941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956.

The product of its digits is 4032, while the sum is 30.

The square root of 21274941 is about 4612.4766666076. The cubic root of 21274941 is about 277.0912348750.

The spelling of 21274941 in words is "twenty-one million, two hundred seventy-four thousand, nine hundred forty-one".