21110021002 has 8 divisors (see below), whose sum is σ = 36188607456. Its totient is φ = 9047151852.

The previous prime is 21110020979. The next prime is 21110021017. The reversal of 21110021002 is 20012001112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21110021002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 753929308 + ... + 753929335.

It is an arithmetic number, because the mean of its divisors is an integer number (4523575932).

Almost surely, 2^21110021002 is an apocalyptic number.

21110021002 is a deficient number, since it is larger than the sum of its proper divisors (15078586454).

21110021002 is a wasteful number, since it uses less digits than its factorization.

21110021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507858652.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21110021002 its reverse (20012001112), we get a palindrome (41122022114).

The spelling of 21110021002 in words is "twenty-one billion, one hundred ten million, twenty-one thousand, two".