21012111002 has 4 divisors (see below), whose sum is σ = 31518166506. Its totient is φ = 10506055500.

The previous prime is 21012110953. The next prime is 21012111013. The reversal of 21012111002 is 20011121012.

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., 20900195761 + 111915241 = 144569^2 + 10579^2 .

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, 5253027749 + ... + 5253027752.

Almost surely, 2^21012111002 is an apocalyptic number.

21012111002 is a deficient number, since it is larger than the sum of its proper divisors (10506055504).

21012111002 is a wasteful number, since it uses less digits than its factorization.

21012111002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10506055503.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21012111002 its reverse (20011121012), we get a palindrome (41023232014).

The spelling of 21012111002 in words is "twenty-one billion, twelve million, one hundred eleven thousand, two".