20312000123221 has 2 divisors, whose sum is σ = 20312000123222. Its totient is φ = 20312000123220.

The previous prime is 20312000123201. The next prime is 20312000123249. The reversal of 20312000123221 is 12232100021302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18541756568196 + 1770243555025 = 4306014^2 + 1330505^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312000123221 - 2¹⁵ = 20312000090453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312000123201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156000061610 + 10156000061611.

It is an arithmetic number, because the mean of its divisors is an integer number (10156000061611).

Almost surely, 2^{20312000123221} is an apocalyptic number.

It is an amenable number.

20312000123221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312000123221 is an equidigital number, since it uses as much as digits as its factorization.

20312000123221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20312000123221 its reverse (12232100021302), we get a palindrome (32544100144523).

The spelling of 20312000123221 in words is "twenty trillion, three hundred twelve billion, one hundred twenty-three thousand, two hundred twenty-one".