221100021137 has 2 divisors, whose sum is σ = 221100021138. Its totient is φ = 221100021136.

The previous prime is 221100021071. The next prime is 221100021167. The reversal of 221100021137 is 731120001122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205209906001 + 15890115136 = 453001^2 + 126056^2 .

It is a cyclic number.

It is not a de Polignac number, because 221100021137 - 2³⁶ = 152380544401 is a prime.

It is not a weakly prime, because it can be changed into another prime (221100021167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110550010568 + 110550010569.

It is an arithmetic number, because the mean of its divisors is an integer number (110550010569).

Almost surely, 2^221100021137 is an apocalyptic number.

It is an amenable number.

221100021137 is a deficient number, since it is larger than the sum of its proper divisors (1).

221100021137 is an equidigital number, since it uses as much as digits as its factorization.

221100021137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 221100021137 its reverse (731120001122), we get a palindrome (952220022259).

The spelling of 221100021137 in words is "two hundred twenty-one billion, one hundred million, twenty-one thousand, one hundred thirty-seven".