100021122220961 has 2 divisors, whose sum is σ = 100021122220962. Its totient is φ = 100021122220960.

The previous prime is 100021122220951. The next prime is 100021122221003. The reversal of 100021122220961 is 169022221120001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99963603312400 + 57518908561 = 9998180^2 + 239831^2 .

It is a cyclic number.

It is not a de Polignac number, because 100021122220961 - 2¹⁸ = 100021121958817 is a prime.

It is not a weakly prime, because it can be changed into another prime (100021122220951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50010561110480 + 50010561110481.

It is an arithmetic number, because the mean of its divisors is an integer number (50010561110481).

Almost surely, 2^{100021122220961} is an apocalyptic number.

It is an amenable number.

100021122220961 is a deficient number, since it is larger than the sum of its proper divisors (1).

100021122220961 is an equidigital number, since it uses as much as digits as its factorization.

100021122220961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

Adding to 100021122220961 its reverse (169022221120001), we get a palindrome (269043343340962).

The spelling of 100021122220961 in words is "one hundred trillion, twenty-one billion, one hundred twenty-two million, two hundred twenty thousand, nine hundred sixty-one".