21115367742 has 32 divisors (see below), whose sum is σ = 48271882752. Its totient is φ = 6031939104.

The previous prime is 21115367731. The next prime is 21115367753. The reversal of 21115367742 is 24776351112.

It is an interprime number because it is at equal distance from previous prime (21115367731) and next prime (21115367753).

It is a self number, because there is not a number n which added to its sum of digits gives 21115367742.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228223 + ... + 307109.

It is an arithmetic number, because the mean of its divisors is an integer number (1508496336).

Almost surely, 2^21115367742 is an apocalyptic number.

21115367742 is an abundant number, since it is smaller than the sum of its proper divisors (27156515010).

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

21115367742 is a wasteful number, since it uses less digits than its factorization.

21115367742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85272.

The product of its digits is 70560, while the sum is 39.

The spelling of 21115367742 in words is "twenty-one billion, one hundred fifteen million, three hundred sixty-seven thousand, seven hundred forty-two".