121000000021001 has 4 divisors (see below), whose sum is σ = 121115347972500. Its totient is φ = 120884652069504.

The previous prime is 121000000020973. The next prime is 121000000021009. The reversal of 121000000021001 is 100120000000121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93409132225600 + 27590867795401 = 9664840^2 + 5252701^2 .

It is a cyclic number.

It is not a de Polignac number, because 121000000021001 - 2¹⁴ = 121000000004617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121000000021001.

It is not an unprimeable number, because it can be changed into a prime (121000000021009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57673974176 + ... + 57673976273.

It is an arithmetic number, because the mean of its divisors is an integer number (30278836993125).

Almost surely, 2^{121000000021001} is an apocalyptic number.

It is an amenable number.

121000000021001 is a deficient number, since it is larger than the sum of its proper divisors (115347951499).

121000000021001 is a wasteful number, since it uses less digits than its factorization.

121000000021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115347951498.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 121000000021001 its reverse (100120000000121), we get a palindrome (221120000021122).

The spelling of 121000000021001 in words is "one hundred twenty-one trillion, twenty-one thousand, one".