1500221421961 has 2 divisors, whose sum is σ = 1500221421962. Its totient is φ = 1500221421960.

The previous prime is 1500221421863. The next prime is 1500221422013. The reversal of 1500221421961 is 1691241220051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1347586652736 + 152634769225 = 1160856^2 + 390685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1500221421961 - 2¹⁷ = 1500221290889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1500221421761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 750110710980 + 750110710981.

It is an arithmetic number, because the mean of its divisors is an integer number (750110710981).

Almost surely, 2^{1500221421961} is an apocalyptic number.

It is an amenable number.

1500221421961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1500221421961 is an equidigital number, since it uses as much as digits as its factorization.

1500221421961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 1500221421961 in words is "one trillion, five hundred billion, two hundred twenty-one million, four hundred twenty-one thousand, nine hundred sixty-one".