21145195080 has 48 divisors (see below), whose sum is σ = 68721885180. Its totient is φ = 5638718592.

The previous prime is 21145195033. The next prime is 21145195087. The reversal of 21145195080 is 8059154112.

21145195080 is a `hidden beast` number, since 2 + 1 + 14 + 519 + 50 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17727857316 + 3417337764 = 133146^2 + 58458^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21145195087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29367967 + ... + 29368686.

Almost surely, 2^21145195080 is an apocalyptic number.

21145195080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21145195080 is an abundant number, since it is smaller than the sum of its proper divisors (47576690100).

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

21145195080 is a wasteful number, since it uses less digits than its factorization.

21145195080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58736670 (or 58736663 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

It can be divided in two parts, 21145 and 195080, that added together give a square (216225 = 465²).

The spelling of 21145195080 in words is "twenty-one billion, one hundred forty-five million, one hundred ninety-five thousand, eighty".