21000010100002 has 4 divisors (see below), whose sum is σ = 31500015150006. Its totient is φ = 10500005050000.

The previous prime is 21000010099973. The next prime is 21000010100021. The reversal of 21000010100002 is 20000101000012.

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., 18979885141281 + 2020124958721 = 4356591^2 + 1421311^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250002524999 + ... + 5250002525002.

Almost surely, 2^{21000010100002} is an apocalyptic number.

21000010100002 is a deficient number, since it is larger than the sum of its proper divisors (10500005050004).

21000010100002 is a wasteful number, since it uses less digits than its factorization.

21000010100002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500005050003.

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

Adding to 21000010100002 its reverse (20000101000012), we get a palindrome (41000111100014).

The spelling of 21000010100002 in words is "twenty-one trillion, ten million, one hundred thousand, two".