121530154521 has 8 divisors (see below), whose sum is σ = 162172704960. Its totient is φ = 80953853552.

The previous prime is 121530154483. The next prime is 121530154531. The reversal of 121530154521 is 125451035121.

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 121530154521 - 2¹⁰ = 121530153497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121530154531) 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, 16558086 + ... + 16565423.

It is an arithmetic number, because the mean of its divisors is an integer number (20271588120).

Almost surely, 2^121530154521 is an apocalyptic number.

It is an amenable number.

121530154521 is a deficient number, since it is larger than the sum of its proper divisors (40642550439).

121530154521 is a wasteful number, since it uses less digits than its factorization.

121530154521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33124735.

The product of its (nonzero) digits is 6000, while the sum is 30.

Adding to 121530154521 its reverse (125451035121), we get a palindrome (246981189642).

The spelling of 121530154521 in words is "one hundred twenty-one billion, five hundred thirty million, one hundred fifty-four thousand, five hundred twenty-one".