21002021221110 has 32 divisors (see below), whose sum is σ = 50410947166560. Its totient is φ = 5599861632768.

The previous prime is 21002021221099. The next prime is 21002021221117. The reversal of 21002021221110 is 1112212020012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21002021221110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002021221117) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 42082767 + ... + 42578906.

It is an arithmetic number, because the mean of its divisors is an integer number (1575342098955).

Almost surely, 2^{21002021221110} is an apocalyptic number.

21002021221110 is an abundant number, since it is smaller than the sum of its proper divisors (29408925945450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21002021221110 is a wasteful number, since it uses less digits than its factorization.

21002021221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84669952.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21002021221110 its reverse (1112212020012), we get a palindrome (22114233241122).

The spelling of 21002021221110 in words is "twenty-one trillion, two billion, twenty-one million, two hundred twenty-one thousand, one hundred ten".