21488677140 has 48 divisors (see below), whose sum is σ = 68763768192. Its totient is φ = 4911697536.

The previous prime is 21488677129. The next prime is 21488677151. The reversal of 21488677140 is 4177688412.

It is an interprime number because it is at equal distance from previous prime (21488677129) and next prime (21488677151).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21488677140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25581339 + ... + 25582178.

It is an arithmetic number, because the mean of its divisors is an integer number (1432578504).

Almost surely, 2^21488677140 is an apocalyptic number.

21488677140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21488677140 is an abundant number, since it is smaller than the sum of its proper divisors (47275091052).

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

21488677140 is a wasteful number, since it uses less digits than its factorization.

21488677140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51163536 (or 51163534 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 48.

The spelling of 21488677140 in words is "twenty-one billion, four hundred eighty-eight million, six hundred seventy-seven thousand, one hundred forty".