21123442032 has 80 divisors (see below), whose sum is σ = 68033955072. Its totient is φ = 5486607360.

The previous prime is 21123442031. The next prime is 21123442057. The reversal of 21123442032 is 23024432112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21123441993 and 21123442011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123442031) 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, 2853913 + ... + 2861304.

Almost surely, 2^21123442032 is an apocalyptic number.

21123442032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21123442032 is an abundant number, since it is smaller than the sum of its proper divisors (46910513040).

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

21123442032 is a wasteful number, since it uses less digits than its factorization.

21123442032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5715246 (or 5715240 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21123442032 its reverse (23024432112), we get a palindrome (44147874144).

The spelling of 21123442032 in words is "twenty-one billion, one hundred twenty-three million, four hundred forty-two thousand, thirty-two".