1202121200091 has 16 divisors (see below), whose sum is σ = 1832457338624. Its totient is φ = 686681298144.

The previous prime is 1202121200047. The next prime is 1202121200213. The reversal of 1202121200091 is 1900021212021.

It is not a de Polignac number, because 1202121200091 - 2⁹ = 1202121199579 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1202121205091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10152316 + ... + 10270041.

It is an arithmetic number, because the mean of its divisors is an integer number (114528583664).

Almost surely, 2^{1202121200091} is an apocalyptic number.

1202121200091 is a deficient number, since it is larger than the sum of its proper divisors (630336138533).

1202121200091 is a wasteful number, since it uses less digits than its factorization.

1202121200091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20425170.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 1202121200091 in words is "one trillion, two hundred two billion, one hundred twenty-one million, two hundred thousand, ninety-one".