21122220002021 has 8 divisors (see below), whose sum is σ = 21339668276160. Its totient is φ = 20905009769952.

The previous prime is 21122220002003. The next prime is 21122220002087. The reversal of 21122220002021 is 12020002222112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21122220002021 - 2²² = 21122215807717 is a prime.

It is a super-2 number, since 2×21122220002021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122220002921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59332136 + ... + 59687073.

It is an arithmetic number, because the mean of its divisors is an integer number (2667458534520).

Almost surely, 2^{21122220002021} is an apocalyptic number.

It is an amenable number.

21122220002021 is a deficient number, since it is larger than the sum of its proper divisors (217448274139).

21122220002021 is a wasteful number, since it uses less digits than its factorization.

21122220002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119021035.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21122220002021 its reverse (12020002222112), we get a palindrome (33142222224133).

The spelling of 21122220002021 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty million, two thousand, twenty-one".