100121191903 has 2 divisors, whose sum is σ = 100121191904. Its totient is φ = 100121191902.

The previous prime is 100121191853. The next prime is 100121191993. The reversal of 100121191903 is 309191121001.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100121191903 is a prime.

It is a super-2 number, since 2×100121191903² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100121191993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060595951 + 50060595952.

It is an arithmetic number, because the mean of its divisors is an integer number (50060595952).

Almost surely, 2^100121191903 is an apocalyptic number.

100121191903 is a deficient number, since it is larger than the sum of its proper divisors (1).

100121191903 is an equidigital number, since it uses as much as digits as its factorization.

100121191903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 28.

The spelling of 100121191903 in words is "one hundred billion, one hundred twenty-one million, one hundred ninety-one thousand, nine hundred three".