21207712441522 has 16 divisors (see below), whose sum is σ = 32911337626200. Its totient is φ = 10237329195520.

The previous prime is 21207712441519. The next prime is 21207712441541. The reversal of 21207712441522 is 22514421770212.

It can be written as a sum of positive squares in 4 ways, for example, as 20834194673601 + 373517767921 = 4564449^2 + 611161^2 .

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, 14973997 + ... + 16328992.

Almost surely, 2^{21207712441522} is an apocalyptic number.

21207712441522 is a deficient number, since it is larger than the sum of its proper divisors (11703625184678).

21207712441522 is a wasteful number, since it uses less digits than its factorization.

21207712441522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31314701.

The product of its (nonzero) digits is 125440, while the sum is 40.

The spelling of 21207712441522 in words is "twenty-one trillion, two hundred seven billion, seven hundred twelve million, four hundred forty-one thousand, five hundred twenty-two".