100121012211901 has 2 divisors, whose sum is σ = 100121012211902. Its totient is φ = 100121012211900.

The previous prime is 100121012211827. The next prime is 100121012211929. The reversal of 100121012211901 is 109112210121001.

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., 97347624920100 + 2773387291801 = 9866490^2 + 1665349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100121012211901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100121012211931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060506105950 + 50060506105951.

It is an arithmetic number, because the mean of its divisors is an integer number (50060506105951).

Almost surely, 2^{100121012211901} is an apocalyptic number.

It is an amenable number.

100121012211901 is a deficient number, since it is larger than the sum of its proper divisors (1).

100121012211901 is an equidigital number, since it uses as much as digits as its factorization.

100121012211901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 22.

Adding to 100121012211901 its reverse (109112210121001), we get a palindrome (209233222332902).

The spelling of 100121012211901 in words is "one hundred trillion, one hundred twenty-one billion, twelve million, two hundred eleven thousand, nine hundred one".