21120111021002 has 48 divisors (see below), whose sum is σ = 37182032173440. Its totient is φ = 8970538292352.

The previous prime is 21120111020971. The next prime is 21120111021043. The reversal of 21120111021002 is 20012011102112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126902399 + ... + 127068717.

It is an arithmetic number, because the mean of its divisors is an integer number (774625670280).

Almost surely, 2^{21120111021002} is an apocalyptic number.

21120111021002 is a deficient number, since it is larger than the sum of its proper divisors (16061921152438).

21120111021002 is a wasteful number, since it uses less digits than its factorization.

21120111021002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177915 (or 177908 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21120111021002 its reverse (20012011102112), we get a palindrome (41132122123114).

It can be divided in two parts, 211201110 and 21002, that added together give a palindrome (211222112).

The spelling of 21120111021002 in words is "twenty-one trillion, one hundred twenty billion, one hundred eleven million, twenty-one thousand, two".