21315140946 has 48 divisors (see below), whose sum is σ = 50411125440. Its totient is φ = 6455302560.

The previous prime is 21315140909. The next prime is 21315140981. The reversal of 21315140946 is 64904151312.

It is a happy number.

21315140946 is a `hidden beast` number, since 2 + 131 + 514 + 0 + 9 + 4 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21315140946.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 312075 + ... + 374193.

It is an arithmetic number, because the mean of its divisors is an integer number (1050231780).

Almost surely, 2^21315140946 is an apocalyptic number.

21315140946 is an abundant number, since it is smaller than the sum of its proper divisors (29095984494).

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

21315140946 is a wasteful number, since it uses less digits than its factorization.

21315140946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63871 (or 63868 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

It can be divided in two parts, 21315 and 140946, that added together give a palindrome (162261).

The spelling of 21315140946 in words is "twenty-one billion, three hundred fifteen million, one hundred forty thousand, nine hundred forty-six".