21002311522 has 8 divisors (see below), whose sum is σ = 31504421376. Its totient is φ = 10500837732.

The previous prime is 21002311469. The next prime is 21002311549. The reversal of 21002311522 is 22511320012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21002311522.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65458 + ... + 215149.

It is an arithmetic number, because the mean of its divisors is an integer number (3938052672).

Almost surely, 2^21002311522 is an apocalyptic number.

21002311522 is a deficient number, since it is larger than the sum of its proper divisors (10502109854).

21002311522 is a wasteful number, since it uses less digits than its factorization.

21002311522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318032.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21002311522 its reverse (22511320012), we get a palindrome (43513631534).

The spelling of 21002311522 in words is "twenty-one billion, two million, three hundred eleven thousand, five hundred twenty-two".