21100021202 has 32 divisors (see below), whose sum is σ = 35857684800. Its totient is φ = 9243275328.

The previous prime is 21100021157. The next prime is 21100021249. The reversal of 21100021202 is 20212000112.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192668 + ... + 281639.

It is an arithmetic number, because the mean of its divisors is an integer number (1120552650).

Almost surely, 2^21100021202 is an apocalyptic number.

21100021202 is a deficient number, since it is larger than the sum of its proper divisors (14757663598).

21100021202 is a wasteful number, since it uses less digits than its factorization.

21100021202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474410.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21100021202 its reverse (20212000112), we get a palindrome (41312021314).

The spelling of 21100021202 in words is "twenty-one billion, one hundred million, twenty-one thousand, two hundred two".