221331220157 has 2 divisors, whose sum is σ = 221331220158. Its totient is φ = 221331220156.

The previous prime is 221331220133. The next prime is 221331220193. The reversal of 221331220157 is 751022133122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205276049476 + 16055170681 = 453074^2 + 126709^2 .

It is a cyclic number.

It is not a de Polignac number, because 221331220157 - 2¹² = 221331216061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221334220157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110665610078 + 110665610079.

It is an arithmetic number, because the mean of its divisors is an integer number (110665610079).

Almost surely, 2^221331220157 is an apocalyptic number.

It is an amenable number.

221331220157 is a deficient number, since it is larger than the sum of its proper divisors (1).

221331220157 is an equidigital number, since it uses as much as digits as its factorization.

221331220157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

Adding to 221331220157 its reverse (751022133122), we get a palindrome (972353353279).

The spelling of 221331220157 in words is "two hundred twenty-one billion, three hundred thirty-one million, two hundred twenty thousand, one hundred fifty-seven".