121001021001 has 12 divisors (see below), whose sum is σ = 199747717312. Its totient is φ = 69143440536.

The previous prime is 121001020997. The next prime is 121001021003. The reversal of 121001021001 is 100120100121.

It is a happy number.

It is not a de Polignac number, because 121001021001 - 2² = 121001020997 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121001021003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 960325501 + ... + 960325626.

Almost surely, 2^121001021001 is an apocalyptic number.

It is an amenable number.

121001021001 is a deficient number, since it is larger than the sum of its proper divisors (78746696311).

121001021001 is a wasteful number, since it uses less digits than its factorization.

121001021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920651140 (or 1920651137 counting only the distinct ones).

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

Adding to 121001021001 its reverse (100120100121), we get a palindrome (221121121122).

The spelling of 121001021001 in words is "one hundred twenty-one billion, one million, twenty-one thousand, one".