21299325780 has 24 divisors (see below), whose sum is σ = 59638112352. Its totient is φ = 5679820192.

The previous prime is 21299325779. The next prime is 21299325781. The reversal of 21299325780 is 8752399212.

It is an interprime number because it is at equal distance from previous prime (21299325779) and next prime (21299325781).

It is a super-2 number, since 2×21299325780² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21299325781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177494322 + ... + 177494441.

It is an arithmetic number, because the mean of its divisors is an integer number (2484921348).

Almost surely, 2^21299325780 is an apocalyptic number.

21299325780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21299325780 is an abundant number, since it is smaller than the sum of its proper divisors (38338786572).

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

21299325780 is a wasteful number, since it uses less digits than its factorization.

21299325780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354988775 (or 354988773 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 21299325780 in words is "twenty-one billion, two hundred ninety-nine million, three hundred twenty-five thousand, seven hundred eighty".