21521452023331 has 8 divisors (see below), whose sum is σ = 23176996863440. Its totient is φ = 19865914116192.

The previous prime is 21521452023301. The next prime is 21521452023341. The reversal of 21521452023331 is 13332025412512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21521452023331 is a prime.

It is a super-2 number, since 2×21521452023331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21521452023301) 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, 5987941 + ... + 8882473.

It is an arithmetic number, because the mean of its divisors is an integer number (2897124607930).

Almost surely, 2^{21521452023331} is an apocalyptic number.

21521452023331 is a deficient number, since it is larger than the sum of its proper divisors (1655544840109).

21521452023331 is a wasteful number, since it uses less digits than its factorization.

21521452023331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3466485.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 21521452023331 its reverse (13332025412512), we get a palindrome (34853477435843).

The spelling of 21521452023331 in words is "twenty-one trillion, five hundred twenty-one billion, four hundred fifty-two million, twenty-three thousand, three hundred thirty-one".