21426936 has 32 divisors (see below), whose sum is σ = 56719440. Its totient is φ = 6722048.

The previous prime is 21426931. The next prime is 21426973. The reversal of 21426936 is 63962412.

It is a super-3 number, since 3×21426936³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21426897 and 21426906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426931) 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, 25851 + ... + 26666.

Almost surely, 2^21426936 is an apocalyptic number.

It is an amenable number.

21426936 is an abundant number, since it is smaller than the sum of its proper divisors (35292504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21426936 is a wasteful number, since it uses less digits than its factorization.

21426936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52543 (or 52539 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 21426936 is about 4628.9238490172. The cubic root of 21426936 is about 277.7495458359.

The spelling of 21426936 in words is "twenty-one million, four hundred twenty-six thousand, nine hundred thirty-six".