21245655233 has 8 divisors (see below), whose sum is σ = 23742373536. Its totient is φ = 18843152800.

The previous prime is 21245655187. The next prime is 21245655241. The reversal of 21245655233 is 33255654212.

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 21245655233 - 2¹⁶ = 21245589697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21245655283) 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, 23553491 + ... + 23554392.

It is an arithmetic number, because the mean of its divisors is an integer number (2967796692).

Almost surely, 2^21245655233 is an apocalyptic number.

It is an amenable number.

21245655233 is a deficient number, since it is larger than the sum of its proper divisors (2496718303).

21245655233 is a wasteful number, since it uses less digits than its factorization.

21245655233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47107935.

The product of its digits is 216000, while the sum is 38.

The spelling of 21245655233 in words is "twenty-one billion, two hundred forty-five million, six hundred fifty-five thousand, two hundred thirty-three".