120451143521 has 4 divisors (see below), whose sum is σ = 120472942272. Its totient is φ = 120429344772.

The previous prime is 120451143517. The next prime is 120451143539. The reversal of 120451143521 is 125341154021.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 120451143521 - 2² = 120451143517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120451142521) 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, 10891085 + ... + 10902138.

It is an arithmetic number, because the mean of its divisors is an integer number (30118235568).

Almost surely, 2^120451143521 is an apocalyptic number.

It is an amenable number.

120451143521 is a deficient number, since it is larger than the sum of its proper divisors (21798751).

120451143521 is an equidigital number, since it uses as much as digits as its factorization.

120451143521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21798750.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 120451143521 its reverse (125341154021), we get a palindrome (245792297542).

The spelling of 120451143521 in words is "one hundred twenty billion, four hundred fifty-one million, one hundred forty-three thousand, five hundred twenty-one".