21123110010 has 32 divisors (see below), whose sum is σ = 50875895232. Its totient is φ = 5612781440.

The previous prime is 21123109999. The next prime is 21123110023. The reversal of 21123110010 is 1001132112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1244424 + ... + 1261283.

It is an arithmetic number, because the mean of its divisors is an integer number (1589871726).

Almost surely, 2^21123110010 is an apocalyptic number.

21123110010 is an abundant number, since it is smaller than the sum of its proper divisors (29752785222).

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

21123110010 is a wasteful number, since it uses less digits than its factorization.

21123110010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2505998.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21123110010 its reverse (1001132112), we get a palindrome (22124242122).

The spelling of 21123110010 in words is "twenty-one billion, one hundred twenty-three million, one hundred ten thousand, ten".