21103181460 has 72 divisors (see below), whose sum is σ = 64105999776. Its totient is φ = 5619337920.

The previous prime is 21103181401. The next prime is 21103181461. The reversal of 21103181460 is 6418130112.

It is a happy number.

21103181460 is a `hidden beast` number, since 21 + 1 + 0 + 3 + 181 + 460 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103181461) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39547 + ... + 209213.

It is an arithmetic number, because the mean of its divisors is an integer number (890361108).

Almost surely, 2^21103181460 is an apocalyptic number.

21103181460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103181460 is an abundant number, since it is smaller than the sum of its proper divisors (43002818316).

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

21103181460 is a wasteful number, since it uses less digits than its factorization.

21103181460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170373 (or 170368 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The spelling of 21103181460 in words is "twenty-one billion, one hundred three million, one hundred eighty-one thousand, four hundred sixty".