121201102020999 has 128 divisors (see below), whose sum is σ = 225045952911360. Its totient is φ = 55987759872000.

The previous prime is 121201102020961. The next prime is 121201102021009. The reversal of 121201102020999 is 999020201102121.

It is a happy number.

It is not a de Polignac number, because 121201102020999 - 2¹² = 121201102016903 is a prime.

It is a super-2 number, since 2×121201102020999² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201102020919) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5822157 + ... + 16622265.

It is an arithmetic number, because the mean of its divisors is an integer number (1758171507120).

Almost surely, 2^{121201102020999} is an apocalyptic number.

121201102020999 is a deficient number, since it is larger than the sum of its proper divisors (103844850890361).

121201102020999 is a wasteful number, since it uses less digits than its factorization.

121201102020999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10800281.

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 121201102020999 in words is "one hundred twenty-one trillion, two hundred one billion, one hundred two million, twenty thousand, nine hundred ninety-nine".