121002565501 has 4 divisors (see below), whose sum is σ = 127371121600. Its totient is φ = 114634009404.

The previous prime is 121002565483. The next prime is 121002565517. The reversal of 121002565501 is 105565200121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 105565200121 = 15017 ⋅7029713.

It is not a de Polignac number, because 121002565501 - 2⁷ = 121002565373 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 121002565501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121002565601) 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, 3184278021 + ... + 3184278058.

It is an arithmetic number, because the mean of its divisors is an integer number (31842780400).

Almost surely, 2^121002565501 is an apocalyptic number.

It is an amenable number.

121002565501 is a deficient number, since it is larger than the sum of its proper divisors (6368556099).

121002565501 is an equidigital number, since it uses as much as digits as its factorization.

121002565501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6368556098.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 121002565501 its reverse (105565200121), we get a palindrome (226567765622).

The spelling of 121002565501 in words is "one hundred twenty-one billion, two million, five hundred sixty-five thousand, five hundred one".