121021010001 has 24 divisors (see below), whose sum is σ = 177096641280. Its totient is φ = 79625310336.

The previous prime is 121021009987. The next prime is 121021010003. The reversal of 121021010001 is 100010120121.

It is a happy number.

It is not a de Polignac number, because 121021010001 - 2⁶ = 121021009937 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 (121021010003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1683276 + ... + 1753698.

It is an arithmetic number, because the mean of its divisors is an integer number (7379026720).

Almost surely, 2^121021010001 is an apocalyptic number.

It is an amenable number.

121021010001 is a deficient number, since it is larger than the sum of its proper divisors (56075631279).

121021010001 is a wasteful number, since it uses less digits than its factorization.

121021010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72925 (or 72922 counting only the distinct ones).

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

Adding to 121021010001 its reverse (100010120121), we get a palindrome (221031130122).

The spelling of 121021010001 in words is "one hundred twenty-one billion, twenty-one million, ten thousand, one".