21180140376 has 72 divisors (see below), whose sum is σ = 53943385860. Its totient is φ = 6930048960.

The previous prime is 21180140327. The next prime is 21180140383. The reversal of 21180140376 is 67304108112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 43490805 + ... + 43491291.

Almost surely, 2^21180140376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21180140376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26971692930).

21180140376 is an abundant number, since it is smaller than the sum of its proper divisors (32763245484).

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

21180140376 is an frugal number, since it uses more digits than its factorization.

21180140376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105 (or 553 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

Adding to 21180140376 its reverse (67304108112), we get a palindrome (88484248488).

The spelling of 21180140376 in words is "twenty-one billion, one hundred eighty million, one hundred forty thousand, three hundred seventy-six".