21840357080 has 32 divisors (see below), whose sum is σ = 49147611840. Its totient is φ = 8734932480.

The previous prime is 21840357061. The next prime is 21840357107. The reversal of 21840357080 is 8075304812.

It is a super-2 number, since 2×21840357080² (a number of 21 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 289457 + ... + 357023.

It is an arithmetic number, because the mean of its divisors is an integer number (1535862870).

Almost surely, 2^21840357080 is an apocalyptic number.

21840357080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21840357080 is an abundant number, since it is smaller than the sum of its proper divisors (27307254760).

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

21840357080 is a wasteful number, since it uses less digits than its factorization.

21840357080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75659 (or 75655 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 21840357080 in words is "twenty-one billion, eight hundred forty million, three hundred fifty-seven thousand, eighty".