121200101001 has 36 divisors (see below), whose sum is σ = 203737950000. Its totient is φ = 69227001648.

The previous prime is 121200100981. The next prime is 121200101021. The reversal of 121200101001 is 100101002121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121200100981) and next prime (121200101021).

It is not a de Polignac number, because 121200101001 - 2⁷ = 121200100873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (121200101021) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 972750 + ... + 1090248.

It is an arithmetic number, because the mean of its divisors is an integer number (5659387500).

Almost surely, 2^121200101001 is an apocalyptic number.

It is an amenable number.

121200101001 is a deficient number, since it is larger than the sum of its proper divisors (82537848999).

121200101001 is a wasteful number, since it uses less digits than its factorization.

121200101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119858 (or 119848 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 121200101001 its reverse (100101002121), we get a palindrome (221301103122).

The spelling of 121200101001 in words is "one hundred twenty-one billion, two hundred million, one hundred one thousand, one".