21154926 has 16 divisors (see below), whose sum is σ = 45564624. Its totient is φ = 6509184.

The previous prime is 21154921. The next prime is 21154943. The reversal of 21154926 is 62945112.

It is a junction number, because it is equal to n+sod(n) for n = 21154893 and 21154902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154921) 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, 135531 + ... + 135686.

It is an arithmetic number, because the mean of its divisors is an integer number (2847789).

Almost surely, 2^21154926 is an apocalyptic number.

21154926 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21154926 is an abundant number, since it is smaller than the sum of its proper divisors (24409698).

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

21154926 is a wasteful number, since it uses less digits than its factorization.

21154926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271235.

The product of its digits is 4320, while the sum is 30.

The square root of 21154926 is about 4599.4484451943. The cubic root of 21154926 is about 276.5692148837.

It can be divided in two parts, 211549 and 26, that added together give a triangular number (211575 = T₆₅₀).

The spelling of 21154926 in words is "twenty-one million, one hundred fifty-four thousand, nine hundred twenty-six".