21120221185802 has 16 divisors (see below), whose sum is σ = 33551464911552. Its totient is φ = 9936680445120.

The previous prime is 21120221185787. The next prime is 21120221185837. The reversal of 21120221185802 is 20858112202112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70071524 + ... + 70372287.

It is an arithmetic number, because the mean of its divisors is an integer number (2096966556972).

Almost surely, 2^{21120221185802} is an apocalyptic number.

21120221185802 is a deficient number, since it is larger than the sum of its proper divisors (12431243725750).

21120221185802 is a wasteful number, since it uses less digits than its factorization.

21120221185802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140448253.

The product of its (nonzero) digits is 10240, while the sum is 35.

Adding to 21120221185802 its reverse (20858112202112), we get a palindrome (41978333387914).

The spelling of 21120221185802 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, one hundred eighty-five thousand, eight hundred two".