21120001202090 has 64 divisors (see below), whose sum is σ = 45339214579200. Its totient is φ = 6925797457920.

The previous prime is 21120001202029. The next prime is 21120001202117. The reversal of 21120001202090 is 9020210002112.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 21546986 + ... + 22505834.

It is an arithmetic number, because the mean of its divisors is an integer number (708425227800).

Almost surely, 2^{21120001202090} is an apocalyptic number.

21120001202090 is an abundant number, since it is smaller than the sum of its proper divisors (24219213377110).

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

21120001202090 is a wasteful number, since it uses less digits than its factorization.

21120001202090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972567.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 21120001202090 in words is "twenty-one trillion, one hundred twenty billion, one million, two hundred two thousand, ninety".