21123310030 has 16 divisors (see below), whose sum is σ = 38067291360. Its totient is φ = 8439249952.

The previous prime is 21123309997. The next prime is 21123310037. The reversal of 21123310030 is 3001332112.

It is a junction number, because it is equal to n+sod(n) for n = 21123309986 and 21123310013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123310037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1250449 + ... + 1267228.

It is an arithmetic number, because the mean of its divisors is an integer number (2379205710).

Almost surely, 2^21123310030 is an apocalyptic number.

21123310030 is a deficient number, since it is larger than the sum of its proper divisors (16943981330).

21123310030 is a wasteful number, since it uses less digits than its factorization.

21123310030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2518523.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21123310030 its reverse (3001332112), we get a palindrome (24124642142).

The spelling of 21123310030 in words is "twenty-one billion, one hundred twenty-three million, three hundred ten thousand, thirty".