21322723800 has 384 divisors, whose sum is σ = 78366412800. Its totient is φ = 4693248000.

The previous prime is 21322723759. The next prime is 21322723813. The reversal of 21322723800 is 832722312.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 50647590 + ... + 50648010.

It is an arithmetic number, because the mean of its divisors is an integer number (204079200).

Almost surely, 2^21322723800 is an apocalyptic number.

21322723800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21322723800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39183206400).

21322723800 is an abundant number, since it is smaller than the sum of its proper divisors (57043689000).

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

21322723800 is a wasteful number, since it uses less digits than its factorization.

21322723800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867 (or 858 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The spelling of 21322723800 in words is "twenty-one billion, three hundred twenty-two million, seven hundred twenty-three thousand, eight hundred".