221100010002021 has 32 divisors (see below), whose sum is σ = 305885251840896. Its totient is φ = 141958575360000.

The previous prime is 221100010001989. The next prime is 221100010002023. The reversal of 221100010002021 is 120200010001122.

It is not a de Polignac number, because 221100010002021 - 2⁵ = 221100010001989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221100010001988 and 221100010002006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100010002023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22219435 + ... + 30592536.

It is an arithmetic number, because the mean of its divisors is an integer number (9558914120028).

Almost surely, 2^{221100010002021} is an apocalyptic number.

It is an amenable number.

221100010002021 is a deficient number, since it is larger than the sum of its proper divisors (84785241838875).

221100010002021 is a wasteful number, since it uses less digits than its factorization.

221100010002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52812453.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221100010002021 its reverse (120200010001122), we get a palindrome (341300020003143).

The spelling of 221100010002021 in words is "two hundred twenty-one trillion, one hundred billion, ten million, two thousand, twenty-one".