21641007223051 has 4 divisors (see below), whose sum is σ = 21641017093792. Its totient is φ = 21640997352312.

The previous prime is 21641007223013. The next prime is 21641007223193. The reversal of 21641007223051 is 15032270014612.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21641007223051 - 2⁹ = 21641007222539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21641007222998 and 21641007223016.

It is not an unprimeable number, because it can be changed into a prime (21641007223001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4755 + ... + 6578908.

It is an arithmetic number, because the mean of its divisors is an integer number (5410254273448).

Almost surely, 2^{21641007223051} is an apocalyptic number.

21641007223051 is a deficient number, since it is larger than the sum of its proper divisors (9870741).

21641007223051 is an equidigital number, since it uses as much as digits as its factorization.

21641007223051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9870740.

The product of its (nonzero) digits is 20160, while the sum is 34.

Adding to 21641007223051 its reverse (15032270014612), we get a palindrome (36673277237663).

The spelling of 21641007223051 in words is "twenty-one trillion, six hundred forty-one billion, seven million, two hundred twenty-three thousand, fifty-one".