21111232023420 has 192 divisors, whose sum is σ = 73883033957376. Its totient is φ = 4375699384320.

The previous prime is 21111232023391. The next prime is 21111232023443. The reversal of 21111232023420 is 2432023211112.

21111232023420 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3920937 + ... + 7589216.

It is an arithmetic number, because the mean of its divisors is an integer number (384807468528).

Almost surely, 2^{21111232023420} is an apocalyptic number.

21111232023420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111232023420 is an abundant number, since it is smaller than the sum of its proper divisors (52771801933956).

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

21111232023420 is a wasteful number, since it uses less digits than its factorization.

21111232023420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11510580 (or 11510578 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21111232023420 its reverse (2432023211112), we get a palindrome (23543255234532).

The spelling of 21111232023420 in words is "twenty-one trillion, one hundred eleven billion, two hundred thirty-two million, twenty-three thousand, four hundred twenty".