21156226253 has 8 divisors (see below), whose sum is σ = 21205140000. Its totient is φ = 21107339568.

The previous prime is 21156226213. The next prime is 21156226277. The reversal of 21156226253 is 35262265112.

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 21156226253 - 2¹⁴ = 21156209869 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 (21156226213) 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, 3124850 + ... + 3131612.

It is an arithmetic number, because the mean of its divisors is an integer number (2650642500).

Almost surely, 2^21156226253 is an apocalyptic number.

It is an amenable number.

21156226253 is a deficient number, since it is larger than the sum of its proper divisors (48913747).

21156226253 is an equidigital number, since it uses as much as digits as its factorization.

21156226253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13531.

The product of its digits is 43200, while the sum is 35.

The spelling of 21156226253 in words is "twenty-one billion, one hundred fifty-six million, two hundred twenty-six thousand, two hundred fifty-three".