21313758020 has 24 divisors (see below), whose sum is σ = 44768274264. Its totient is φ = 8523716096.

The previous prime is 21313758001. The next prime is 21313758023. The reversal of 21313758020 is 2085731312.

It can be written as a sum of positive squares in 4 ways, for example, as 3013696 + 21310744324 = 1736^2 + 145982^2 .

It is a super-2 number, since 2×21313758020² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21313758023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11717 + ... + 206796.

It is an arithmetic number, because the mean of its divisors is an integer number (1865344761).

Almost surely, 2^21313758020 is an apocalyptic number.

21313758020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21313758020 is an abundant number, since it is smaller than the sum of its proper divisors (23454516244).

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

21313758020 is a wasteful number, since it uses less digits than its factorization.

21313758020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223399 (or 223397 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 21313758020 in words is "twenty-one billion, three hundred thirteen million, seven hundred fifty-eight thousand, twenty".