21893922740 has 48 divisors (see below), whose sum is σ = 46172467152. Its totient is φ = 8720464896.

The previous prime is 21893922731. The next prime is 21893922749. The reversal of 21893922740 is 4722939812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21893922731) and next prime (21893922749).

It can be written as a sum of positive squares in 8 ways, for example, as 453349264 + 21440573476 = 21292^2 + 146426^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21893922749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5373344 + ... + 5377416.

It is an arithmetic number, because the mean of its divisors is an integer number (961926399).

Almost surely, 2^21893922740 is an apocalyptic number.

21893922740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21893922740 is an abundant number, since it is smaller than the sum of its proper divisors (24278544412).

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

21893922740 is a wasteful number, since it uses less digits than its factorization.

21893922740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5156 (or 5154 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 21893922740 in words is "twenty-one billion, eight hundred ninety-three million, nine hundred twenty-two thousand, seven hundred forty".