21502230554010 has 16 divisors (see below), whose sum is σ = 51605353329696. Its totient is φ = 5733928147728.

The previous prime is 21502230553997. The next prime is 21502230554011. The reversal of 21502230554010 is 1045503220512.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 716741018467 = 21502230554010 / (2 + 1 + 5 + 0 + 2 + 2 + 3 + 0 + 5 + 5 + 4 + 0 + 1 + 0).

It is not an unprimeable number, because it can be changed into a prime (21502230554011) 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, 358370509204 + ... + 358370509263.

It is an arithmetic number, because the mean of its divisors is an integer number (3225334583106).

Almost surely, 2^{21502230554010} is an apocalyptic number.

21502230554010 is an abundant number, since it is smaller than the sum of its proper divisors (30103122775686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21502230554010 is a wasteful number, since it uses less digits than its factorization.

21502230554010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716741018477.

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 21502230554010 its reverse (1045503220512), we get a palindrome (22547733774522).

The spelling of 21502230554010 in words is "twenty-one trillion, five hundred two billion, two hundred thirty million, five hundred fifty-four thousand, ten".