21021214515522 has 16 divisors (see below), whose sum is σ = 45276462033600. Its totient is φ = 6468066004752.

The previous prime is 21021214515467. The next prime is 21021214515533. The reversal of 21021214515522 is 22551541212012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134751375022 + ... + 134751375177.

It is an arithmetic number, because the mean of its divisors is an integer number (2829778877100).

Almost surely, 2^{21021214515522} is an apocalyptic number.

21021214515522 is an abundant number, since it is smaller than the sum of its proper divisors (24255247518078).

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

21021214515522 is a wasteful number, since it uses less digits than its factorization.

21021214515522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269502750217.

The product of its (nonzero) digits is 16000, while the sum is 33.

Adding to 21021214515522 its reverse (22551541212012), we get a palindrome (43572755727534).

The spelling of 21021214515522 in words is "twenty-one trillion, twenty-one billion, two hundred fourteen million, five hundred fifteen thousand, five hundred twenty-two".