21125214253 has 8 divisors (see below), whose sum is σ = 24818433696. Its totient is φ = 17727452400.

The previous prime is 21125214241. The next prime is 21125214293. The reversal of 21125214253 is 35241252112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21125214253 - 2⁹ = 21125213741 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 (21125214293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73864243 + ... + 73864528.

It is an arithmetic number, because the mean of its divisors is an integer number (3102304212).

Almost surely, 2^21125214253 is an apocalyptic number.

It is an amenable number.

21125214253 is a deficient number, since it is larger than the sum of its proper divisors (3693219443).

21125214253 is a wasteful number, since it uses less digits than its factorization.

21125214253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147728795.

The product of its digits is 4800, while the sum is 28.

Adding to 21125214253 its reverse (35241252112), we get a palindrome (56366466365).

The spelling of 21125214253 in words is "twenty-one billion, one hundred twenty-five million, two hundred fourteen thousand, two hundred fifty-three".