121503321451 has 16 divisors (see below), whose sum is σ = 130489665120. Its totient is φ = 112729098240.

The previous prime is 121503321389. The next prime is 121503321523. The reversal of 121503321451 is 154123305121.

It is a cyclic number.

It is not a de Polignac number, because 121503321451 - 2¹³ = 121503313259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121503321551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379495 + ... + 622111.

It is an arithmetic number, because the mean of its divisors is an integer number (8155604070).

Almost surely, 2^121503321451 is an apocalyptic number.

121503321451 is a deficient number, since it is larger than the sum of its proper divisors (8986343669).

121503321451 is a wasteful number, since it uses less digits than its factorization.

121503321451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243054.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 121503321451 its reverse (154123305121), we get a palindrome (275626626572).

The spelling of 121503321451 in words is "one hundred twenty-one billion, five hundred three million, three hundred twenty-one thousand, four hundred fifty-one".