21153151 has 16 divisors (see below), whose sum is σ = 23444640. Its totient is φ = 18995200.

The previous prime is 21153133. The next prime is 21153161. The reversal of 21153151 is 15135112.

It is a cyclic number.

It is not a de Polignac number, because 21153151 - 2¹⁵ = 21120383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52551 + ... + 52951.

It is an arithmetic number, because the mean of its divisors is an integer number (1465290).

Almost surely, 2^21153151 is an apocalyptic number.

21153151 is a deficient number, since it is larger than the sum of its proper divisors (2291489).

21153151 is a wasteful number, since it uses less digits than its factorization.

21153151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554.

The product of its digits is 150, while the sum is 19.

The square root of 21153151 is about 4599.2554832277. The cubic root of 21153151 is about 276.5614795051.

Adding to 21153151 its reverse (15135112), we get a palindrome (36288263).

The spelling of 21153151 in words is "twenty-one million, one hundred fifty-three thousand, one hundred fifty-one".