21232123040 has 96 divisors (see below), whose sum is σ = 53324490240. Its totient is φ = 7966080000.

The previous prime is 21232123037. The next prime is 21232123043. The reversal of 21232123040 is 4032123212.

It is an interprime number because it is at equal distance from previous prime (21232123037) and next prime (21232123043).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (21232123043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272465 + ... + 341615.

It is an arithmetic number, because the mean of its divisors is an integer number (555463440).

Almost surely, 2^21232123040 is an apocalyptic number.

21232123040 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 21232123040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26662245120).

21232123040 is an abundant number, since it is smaller than the sum of its proper divisors (32092367200).

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

21232123040 is a wasteful number, since it uses less digits than its factorization.

21232123040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69286 (or 69278 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21232123040 its reverse (4032123212), we get a palindrome (25264246252).

The spelling of 21232123040 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-three thousand, forty".