21529273380 has 48 divisors (see below), whose sum is σ = 60294072384. Its totient is φ = 5739986560.

The previous prime is 21529273351. The next prime is 21529273387. The reversal of 21529273380 is 8337292512.

It is a super-2 number, since 2×21529273380² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21529273387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289519 + ... + 356201.

It is an arithmetic number, because the mean of its divisors is an integer number (1256126508).

Almost surely, 2^21529273380 is an apocalyptic number.

21529273380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21529273380 is an abundant number, since it is smaller than the sum of its proper divisors (38764799004).

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

21529273380 is a wasteful number, since it uses less digits than its factorization.

21529273380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72076 (or 72074 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 21529273380 in words is "twenty-one billion, five hundred twenty-nine million, two hundred seventy-three thousand, three hundred eighty".