121511221501 has 8 divisors (see below), whose sum is σ = 128049709824. Its totient is φ = 115077349200.

The previous prime is 121511221483. The next prime is 121511221537. The reversal of 121511221501 is 105122115121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121511221501 - 2¹³ = 121511213309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121511221561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26151621 + ... + 26156266.

It is an arithmetic number, because the mean of its divisors is an integer number (16006213728).

Almost surely, 2^121511221501 is an apocalyptic number.

It is an amenable number.

121511221501 is a deficient number, since it is larger than the sum of its proper divisors (6538488323).

121511221501 is a wasteful number, since it uses less digits than its factorization.

121511221501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52308011.

The product of its (nonzero) digits is 200, while the sum is 22.

Adding to 121511221501 its reverse (105122115121), we get a palindrome (226633336622).

The spelling of 121511221501 in words is "one hundred twenty-one billion, five hundred eleven million, two hundred twenty-one thousand, five hundred one".