21354602220724 has 6 divisors (see below), whose sum is σ = 37370553886274. Its totient is φ = 10677301110360.

The previous prime is 21354602220709. The next prime is 21354602220761. The reversal of 21354602220724 is 42702220645312.

It can be written as a sum of positive squares in only one way, i.e., 13124187143824 + 8230415076900 = 3622732^2 + 2868870^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2669325277587 + ... + 2669325277594.

Almost surely, 2^{21354602220724} is an apocalyptic number.

It is an amenable number.

21354602220724 is a deficient number, since it is larger than the sum of its proper divisors (16015951665550).

21354602220724 is a wasteful number, since it uses less digits than its factorization.

21354602220724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5338650555185 (or 5338650555183 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 40.

The spelling of 21354602220724 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred two million, two hundred twenty thousand, seven hundred twenty-four".