21022740000 has 600 divisors, whose sum is σ = 81444741840. Its totient is φ = 5303232000.

The previous prime is 21022739999. The next prime is 21022740043. The reversal of 21022740000 is 4722012.

It is a tau number, because it is divible by the number of its divisors (600).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 30779659 + ... + 30780341.

Almost surely, 2^21022740000 is an apocalyptic number.

21022740000 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 21022740000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40722370920).

21022740000 is an abundant number, since it is smaller than the sum of its proper divisors (60422001840).

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

21022740000 is an equidigital number, since it uses as much as digits as its factorization.

21022740000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744 (or 712 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The spelling of 21022740000 in words is "twenty-one billion, twenty-two million, seven hundred forty thousand".