21357153 has 12 divisors (see below), whose sum is σ = 31150080. Its totient is φ = 14099256.

The previous prime is 21357107. The next prime is 21357191. The reversal of 21357153 is 35175312.

It is not a de Polignac number, because 21357153 - 2⁸ = 21356897 is a prime.

It is a super-2 number, since 2×21357153² = 912255968530818, which contains 22 as substring.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21357053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10593 + ... + 12446.

It is an arithmetic number, because the mean of its divisors is an integer number (2595840).

Almost surely, 2^21357153 is an apocalyptic number.

It is an amenable number.

21357153 is a deficient number, since it is larger than the sum of its proper divisors (9792927).

21357153 is a wasteful number, since it uses less digits than its factorization.

21357153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23148 (or 23145 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 21357153 is about 4621.3799887047. The cubic root of 21357153 is about 277.4476940616.

The spelling of 21357153 in words is "twenty-one million, three hundred fifty-seven thousand, one hundred fifty-three".