21053154 has 16 divisors (see below), whose sum is σ = 43464960. Its totient is φ = 6791280.

The previous prime is 21053129. The next prime is 21053173. The reversal of 21053154 is 45135012.

It is a self number, because there is not a number n which added to its sum of digits gives 21053154.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56409 + ... + 56780.

It is an arithmetic number, because the mean of its divisors is an integer number (2716560).

Almost surely, 2^21053154 is an apocalyptic number.

21053154 is an abundant number, since it is smaller than the sum of its proper divisors (22411806).

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

21053154 is a wasteful number, since it uses less digits than its factorization.

21053154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113225.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 21053154 is about 4588.3716065724. The cubic root of 21053154 is about 276.1249958928.

Adding to 21053154 its reverse (45135012), we get a palindrome (66188166).

The spelling of 21053154 in words is "twenty-one million, fifty-three thousand, one hundred fifty-four".