121264021 has 4 divisors (see below), whose sum is σ = 121838944. Its totient is φ = 120689100.

The previous prime is 121263983. The next prime is 121264067. The reversal of 121264021 is 120462121.

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 a de Polignac number, because none of the positive numbers 2^k-121264021 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 121264021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121264421) 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, 287145 + ... + 287566.

It is an arithmetic number, because the mean of its divisors is an integer number (30459736).

Almost surely, 2^121264021 is an apocalyptic number.

It is an amenable number.

121264021 is a deficient number, since it is larger than the sum of its proper divisors (574923).

121264021 is an equidigital number, since it uses as much as digits as its factorization.

121264021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574922.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 121264021 is about 11011.9944151820. The cubic root of 121264021 is about 494.9682270529.

The spelling of 121264021 in words is "one hundred twenty-one million, two hundred sixty-four thousand, twenty-one".