21010123002 has 32 divisors (see below), whose sum is σ = 45879851520. Its totient is φ = 6361206320.

The previous prime is 21010122989. The next prime is 21010123019. The reversal of 21010123002 is 20032101012.

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, 60102 + ... + 213617.

It is an arithmetic number, because the mean of its divisors is an integer number (1433745360).

Almost surely, 2^21010123002 is an apocalyptic number.

21010123002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21010123002 is an abundant number, since it is smaller than the sum of its proper divisors (24869728518).

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

21010123002 is a wasteful number, since it uses less digits than its factorization.

21010123002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274898.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21010123002 its reverse (20032101012), we get a palindrome (41042224014).

The spelling of 21010123002 in words is "twenty-one billion, ten million, one hundred twenty-three thousand, two".