21148663810540 has 48 divisors (see below), whose sum is σ = 50779833737472. Its totient is φ = 7247678936256.

The previous prime is 21148663810537. The next prime is 21148663810583. The reversal of 21148663810540 is 4501836684112.

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, 33977074 + ... + 34593913.

It is an arithmetic number, because the mean of its divisors is an integer number (1057913202864).

Almost surely, 2^{21148663810540} is an apocalyptic number.

21148663810540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21148663810540 is an abundant number, since it is smaller than the sum of its proper divisors (29631169926932).

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

21148663810540 is a wasteful number, since it uses less digits than its factorization.

21148663810540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68573206 (or 68573204 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 49.

The spelling of 21148663810540 in words is "twenty-one trillion, one hundred forty-eight billion, six hundred sixty-three million, eight hundred ten thousand, five hundred forty".