21123223211120 has 80 divisors (see below), whose sum is σ = 50807523780000. Its totient is φ = 8157528228864.

The previous prime is 21123223211107. The next prime is 21123223211201. The reversal of 21123223211120 is 2111232232112.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48640706 + ... + 49073054.

It is an arithmetic number, because the mean of its divisors is an integer number (635094047250).

Almost surely, 2^{21123223211120} is an apocalyptic number.

21123223211120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21123223211120 is an abundant number, since it is smaller than the sum of its proper divisors (29684300568880).

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

21123223211120 is a wasteful number, since it uses less digits than its factorization.

21123223211120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453450 (or 453444 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21123223211120 its reverse (2111232232112), we get a palindrome (23234455443232).

The spelling of 21123223211120 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred twenty-three million, two hundred eleven thousand, one hundred twenty".