21426354 has 24 divisors (see below), whose sum is σ = 47557692. Its totient is φ = 6967680.

The previous prime is 21426343. The next prime is 21426359. The reversal of 21426354 is 45362412.

21426354 is a `hidden beast` number, since 21 + 4 + 2 + 635 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18792225 + 2634129 = 4335^2 + 1623^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13779 + ... + 15254.

Almost surely, 2^21426354 is an apocalyptic number.

21426354 is an abundant number, since it is smaller than the sum of its proper divisors (26131338).

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

21426354 is a wasteful number, since it uses less digits than its factorization.

21426354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29082 (or 29079 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 21426354 is about 4628.8609830065. The cubic root of 21426354 is about 277.7470310620.

Adding to 21426354 its reverse (45362412), we get a palindrome (66788766).

The spelling of 21426354 in words is "twenty-one million, four hundred twenty-six thousand, three hundred fifty-four".