21520617737332 has 24 divisors (see below), whose sum is σ = 43044120531776. Its totient is φ = 9222503660928.

The previous prime is 21520617737321. The next prime is 21520617737387. The reversal of 21520617737332 is 23373771602512.

It is a congruent number.

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, 25334133 + ... + 26169820.

Almost surely, 2^{21520617737332} is an apocalyptic number.

It is an amenable number.

21520617737332 is an abundant number, since it is smaller than the sum of its proper divisors (21523502794444).

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

21520617737332 is a wasteful number, since it uses less digits than its factorization.

21520617737332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51518887 (or 51518885 counting only the distinct ones).

The product of its (nonzero) digits is 2222640, while the sum is 49.

The spelling of 21520617737332 in words is "twenty-one trillion, five hundred twenty billion, six hundred seventeen million, seven hundred thirty-seven thousand, three hundred thirty-two".