100121000001989 has 2 divisors, whose sum is σ = 100121000001990. Its totient is φ = 100121000001988.

The previous prime is 100121000001907. The next prime is 100121000002021. The reversal of 100121000001989 is 989100000121001.

It is an a-pointer prime, because the next prime (100121000002021) can be obtained adding 100121000001989 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92152896136900 + 7968103865089 = 9599630^2 + 2822783^2 .

It is a cyclic number.

It is not a de Polignac number, because 100121000001989 - 2³² = 100116705034693 is a prime.

It is a super-2 number, since 2×100121000001989² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100121000801989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060500000994 + 50060500000995.

It is an arithmetic number, because the mean of its divisors is an integer number (50060500000995).

Almost surely, 2^{100121000001989} is an apocalyptic number.

It is an amenable number.

100121000001989 is a deficient number, since it is larger than the sum of its proper divisors (1).

100121000001989 is an equidigital number, since it uses as much as digits as its factorization.

100121000001989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 32.

The spelling of 100121000001989 in words is "one hundred trillion, one hundred twenty-one billion, one thousand, nine hundred eighty-nine".