21150221253 has 16 divisors (see below), whose sum is σ = 32238128640. Its totient is φ = 12082383216.

The previous prime is 21150221227. The next prime is 21150221263. The reversal of 21150221253 is 35212205112.

It is not a de Polignac number, because 21150221253 - 2⁸ = 21150220997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150221263) 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, 67975 + ... + 216612.

It is an arithmetic number, because the mean of its divisors is an integer number (2014883040).

Almost surely, 2^21150221253 is an apocalyptic number.

It is an amenable number.

21150221253 is a deficient number, since it is larger than the sum of its proper divisors (11087907387).

21150221253 is a wasteful number, since it uses less digits than its factorization.

21150221253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288136.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21150221253 its reverse (35212205112), we get a palindrome (56362426365).

The spelling of 21150221253 in words is "twenty-one billion, one hundred fifty million, two hundred twenty-one thousand, two hundred fifty-three".