100121121205 has 16 divisors (see below), whose sum is σ = 144535754880. Its totient is φ = 65041088832.

The previous prime is 100121121193. The next prime is 100121121229. The reversal of 100121121205 is 502121121001.

It is a cyclic number.

It is not a de Polignac number, because 100121121205 - 2¹¹ = 100121119157 is a prime.

It is a super-2 number, since 2×100121121205² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75278374 + ... + 75279703.

It is an arithmetic number, because the mean of its divisors is an integer number (9033484680).

Almost surely, 2^100121121205 is an apocalyptic number.

It is an amenable number.

100121121205 is a deficient number, since it is larger than the sum of its proper divisors (44414633675).

100121121205 is a wasteful number, since it uses less digits than its factorization.

100121121205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150558108.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 100121121205 its reverse (502121121001), we get a palindrome (602242242206).

The spelling of 100121121205 in words is "one hundred billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred five".