774121021 has 8 divisors (see below), whose sum is σ = 797594040. Its totient is φ = 750976512.

The previous prime is 774121003. The next prime is 774121031. The reversal of 774121021 is 120121477.

It can be written as a sum of positive squares in 4 ways, for example, as 118504996 + 655616025 = 10886^2 + 25605^2 .

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 774121021 - 2⁹ = 774120509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (774121031) 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, 77340 + ... + 86773.

It is an arithmetic number, because the mean of its divisors is an integer number (99699255).

Almost surely, 2^774121021 is an apocalyptic number.

It is an amenable number.

774121021 is a deficient number, since it is larger than the sum of its proper divisors (23473019).

774121021 is a wasteful number, since it uses less digits than its factorization.

774121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164255.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 774121021 is about 27823.0304064816. The cubic root of 774121021 is about 918.1978825620.

Adding to 774121021 its reverse (120121477), we get a palindrome (894242498).

The spelling of 774121021 in words is "seven hundred seventy-four million, one hundred twenty-one thousand, twenty-one".