21123031882 has 8 divisors (see below), whose sum is σ = 31723618752. Its totient is φ = 10548492300.

The previous prime is 21123031877. The next prime is 21123031883. The reversal of 21123031882 is 28813032112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21123031883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6509794 + ... + 6513037.

It is an arithmetic number, because the mean of its divisors is an integer number (3965452344).

Almost surely, 2^21123031882 is an apocalyptic number.

21123031882 is a deficient number, since it is larger than the sum of its proper divisors (10600586870).

21123031882 is a wasteful number, since it uses less digits than its factorization.

21123031882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13023644.

The product of its (nonzero) digits is 4608, while the sum is 31.

Adding to 21123031882 its reverse (28813032112), we get a palindrome (49936063994).

The spelling of 21123031882 in words is "twenty-one billion, one hundred twenty-three million, thirty-one thousand, eight hundred eighty-two".