21001100022320 has 40 divisors (see below), whose sum is σ = 53266426422480. Its totient is φ = 7636763644160.

The previous prime is 21001100022317. The next prime is 21001100022323. The reversal of 21001100022320 is 2322000110012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21001100022317) and next prime (21001100022323).

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 21001100022295 and 21001100022304.

It is not an unprimeable number, because it can be changed into a prime (21001100022323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11932442315 + ... + 11932444074.

It is an arithmetic number, because the mean of its divisors is an integer number (1331660660562).

Almost surely, 2^{21001100022320} is an apocalyptic number.

21001100022320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001100022320 is an abundant number, since it is smaller than the sum of its proper divisors (32265326400160).

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

21001100022320 is a wasteful number, since it uses less digits than its factorization.

21001100022320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23864886413 (or 23864886407 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21001100022320 its reverse (2322000110012), we get a palindrome (23323100132332).

The spelling of 21001100022320 in words is "twenty-one trillion, one billion, one hundred million, twenty-two thousand, three hundred twenty".