21100023002 has 8 divisors (see below), whose sum is σ = 31655344212. Its totient is φ = 10548241600.

The previous prime is 21100022929. The next prime is 21100023011. The reversal of 21100023002 is 20032000112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20558111161 + 541911841 = 143381^2 + 23279^2 .

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

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, 869999 + ... + 893922.

Almost surely, 2^21100023002 is an apocalyptic number.

21100023002 is a deficient number, since it is larger than the sum of its proper divisors (10555321210).

21100023002 is a wasteful number, since it uses less digits than its factorization.

21100023002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769904.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21100023002 its reverse (20032000112), we get a palindrome (41132023114).

The spelling of 21100023002 in words is "twenty-one billion, one hundred million, twenty-three thousand, two".