15345412100021 has 2 divisors, whose sum is σ = 15345412100022. Its totient is φ = 15345412100020.

The previous prime is 15345412099987. The next prime is 15345412100033. The reversal of 15345412100021 is 12000121454351.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15325549425796 + 19862674225 = 3914786^2 + 140935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15345412100021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15345412100041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7672706050010 + 7672706050011.

It is an arithmetic number, because the mean of its divisors is an integer number (7672706050011).

Almost surely, 2^{15345412100021} is an apocalyptic number.

It is an amenable number.

15345412100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

15345412100021 is an equidigital number, since it uses as much as digits as its factorization.

15345412100021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 15345412100021 its reverse (12000121454351), we get a palindrome (27345533554372).

The spelling of 15345412100021 in words is "fifteen trillion, three hundred forty-five billion, four hundred twelve million, one hundred thousand, twenty-one".