221200102021 has 2 divisors, whose sum is σ = 221200102022. Its totient is φ = 221200102020.

The previous prime is 221200101977. The next prime is 221200102063. The reversal of 221200102021 is 120201002122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196483860225 + 24716241796 = 443265^2 + 157214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221200102021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221200101992 and 221200102010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221200102091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600051010 + 110600051011.

It is an arithmetic number, because the mean of its divisors is an integer number (110600051011).

Almost surely, 2^221200102021 is an apocalyptic number.

It is an amenable number.

221200102021 is a deficient number, since it is larger than the sum of its proper divisors (1).

221200102021 is an equidigital number, since it uses as much as digits as its factorization.

221200102021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221200102021 its reverse (120201002122), we get a palindrome (341401104143).

The spelling of 221200102021 in words is "two hundred twenty-one billion, two hundred million, one hundred two thousand, twenty-one".