21303658620 has 72 divisors (see below), whose sum is σ = 65506358736. Its totient is φ = 5603150592.

The previous prime is 21303658577. The next prime is 21303658637. The reversal of 21303658620 is 2685630312.

It is a happy number.

21303658620 is a `hidden beast` number, since 21 + 3 + 0 + 3 + 6 + 5 + 8 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 797502 + ... + 823781.

It is an arithmetic number, because the mean of its divisors is an integer number (909810538).

Almost surely, 2^21303658620 is an apocalyptic number.

21303658620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21303658620 is an abundant number, since it is smaller than the sum of its proper divisors (44202700116).

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

21303658620 is a wasteful number, since it uses less digits than its factorization.

21303658620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621371 (or 1621366 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 21303658620 in words is "twenty-one billion, three hundred three million, six hundred fifty-eight thousand, six hundred twenty".