21221101202090 has 32 divisors (see below), whose sum is σ = 38258063933760. Its totient is φ = 8475090408064.

The previous prime is 21221101202089. The next prime is 21221101202219. The reversal of 21221101202090 is 9020210112212.

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 15 ways as a sum of consecutive naturals, for example, 134310917 + ... + 134468823.

It is an arithmetic number, because the mean of its divisors is an integer number (1195564497930).

Almost surely, 2^{21221101202090} is an apocalyptic number.

21221101202090 is a deficient number, since it is larger than the sum of its proper divisors (17036962731670).

21221101202090 is a wasteful number, since it uses less digits than its factorization.

21221101202090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178966.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21221101202090 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, two hundred two thousand, ninety".