21426131 has 8 divisors (see below), whose sum is σ = 21868800. Its totient is φ = 20987208.

The previous prime is 21426109. The next prime is 21426161. The reversal of 21426131 is 13162412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21426131 - 2²² = 17231827 is a prime.

It is a super-2 number, since 2×21426131² = 918158179258322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21426101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12530 + ... + 14136.

It is an arithmetic number, because the mean of its divisors is an integer number (2733600).

Almost surely, 2^21426131 is an apocalyptic number.

21426131 is a deficient number, since it is larger than the sum of its proper divisors (442669).

21426131 is a wasteful number, since it uses less digits than its factorization.

21426131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873.

The product of its digits is 288, while the sum is 20.

The square root of 21426131 is about 4628.8368949446. The cubic root of 21426131 is about 277.7460674854.

Adding to 21426131 its reverse (13162412), we get a palindrome (34588543).

The spelling of 21426131 in words is "twenty-one million, four hundred twenty-six thousand, one hundred thirty-one".