21892112712 has 96 divisors (see below), whose sum is σ = 62814917880. Its totient is φ = 6864168960.

The previous prime is 21892112699. The next prime is 21892112713. The reversal of 21892112712 is 21721129812.

It can be written as a sum of positive squares in 4 ways, for example, as 21890386116 + 1726596 = 147954^2 + 1314^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21892112713) 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, 2714478 + ... + 2722530.

Almost surely, 2^21892112712 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 21892112712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31407458940).

21892112712 is an abundant number, since it is smaller than the sum of its proper divisors (40922805168).

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

21892112712 is a wasteful number, since it uses less digits than its factorization.

21892112712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10303 (or 10296 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The spelling of 21892112712 in words is "twenty-one billion, eight hundred ninety-two million, one hundred twelve thousand, seven hundred twelve".