124020402351221 has 2 divisors, whose sum is σ = 124020402351222. Its totient is φ = 124020402351220.

The previous prime is 124020402351101. The next prime is 124020402351247. The reversal of 124020402351221 is 122153204020421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62813328336196 + 61207074015025 = 7925486^2 + 7823495^2 .

It is a cyclic number.

It is not a de Polignac number, because 124020402351221 - 2¹⁰ = 124020402350197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124020402351421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62010201175610 + 62010201175611.

It is an arithmetic number, because the mean of its divisors is an integer number (62010201175611).

Almost surely, 2^{124020402351221} is an apocalyptic number.

It is an amenable number.

124020402351221 is a deficient number, since it is larger than the sum of its proper divisors (1).

124020402351221 is an equidigital number, since it uses as much as digits as its factorization.

124020402351221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 124020402351221 its reverse (122153204020421), we get a palindrome (246173606371642).

The spelling of 124020402351221 in words is "one hundred twenty-four trillion, twenty billion, four hundred two million, three hundred fifty-one thousand, two hundred twenty-one".