21270153 has 12 divisors (see below), whose sum is σ = 29153040. Its totient is φ = 13794192.

The previous prime is 21270143. The next prime is 21270157. The reversal of 21270153 is 35107212.

It is not a de Polignac number, because 21270153 - 2⁵ = 21270121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21270157) 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, 1518 + ... + 6696.

It is an arithmetic number, because the mean of its divisors is an integer number (2429420).

Almost surely, 2^21270153 is an apocalyptic number.

It is an amenable number.

21270153 is a deficient number, since it is larger than the sum of its proper divisors (7882887).

21270153 is an equidigital number, since it uses as much as digits as its factorization.

21270153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5256 (or 5219 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 21270153 is about 4611.9576103863. The cubic root of 21270153 is about 277.0704465310.

Adding to 21270153 its reverse (35107212), we get a palindrome (56377365).

The spelling of 21270153 in words is "twenty-one million, two hundred seventy thousand, one hundred fifty-three".