21050010023 has 4 divisors (see below), whose sum is σ = 24057154320. Its totient is φ = 18042865728.

The previous prime is 21050010013. The next prime is 21050010139. The reversal of 21050010023 is 32001005012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21050010023 - 2⁸ = 21050009767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050010013) 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, 1503572138 + ... + 1503572151.

It is an arithmetic number, because the mean of its divisors is an integer number (6014288580).

Almost surely, 2^21050010023 is an apocalyptic number.

21050010023 is a deficient number, since it is larger than the sum of its proper divisors (3007144297).

21050010023 is an equidigital number, since it uses as much as digits as its factorization.

21050010023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3007144296.

The product of its (nonzero) digits is 60, while the sum is 14.

Adding to 21050010023 its reverse (32001005012), we get a palindrome (53051015035).

The spelling of 21050010023 in words is "twenty-one billion, fifty million, ten thousand, twenty-three".