21529073620 has 24 divisors (see below), whose sum is σ = 45214331904. Its totient is φ = 8611005216.

The previous prime is 21529073597. The next prime is 21529073669. The reversal of 21529073620 is 2637092512.

It is a self number, because there is not a number n which added to its sum of digits gives 21529073620.

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, 327997 + ... + 388123.

It is an arithmetic number, because the mean of its divisors is an integer number (1883930496).

Almost surely, 2^21529073620 is an apocalyptic number.

21529073620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21529073620 is an abundant number, since it is smaller than the sum of its proper divisors (23685258284).

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

21529073620 is a wasteful number, since it uses less digits than its factorization.

21529073620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78039 (or 78037 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 21529073620 in words is "twenty-one billion, five hundred twenty-nine million, seventy-three thousand, six hundred twenty".