21010100002 has 4 divisors (see below), whose sum is σ = 31515150006. Its totient is φ = 10505050000.

The previous prime is 21010099987. The next prime is 21010100021. The reversal of 21010100002 is 20000101012.

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

It can be written as a sum of positive squares in only one way, i.e., 15619750441 + 5390349561 = 124979^2 + 73419^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252524999 + ... + 5252525002.

Almost surely, 2^21010100002 is an apocalyptic number.

21010100002 is a deficient number, since it is larger than the sum of its proper divisors (10505050004).

21010100002 is a wasteful number, since it uses less digits than its factorization.

21010100002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505050003.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21010100002 its reverse (20000101012), we get a palindrome (41010201014).

The spelling of 21010100002 in words is "twenty-one billion, ten million, one hundred thousand, two".