1423121021 has 16 divisors (see below), whose sum is σ = 1698299904. Its totient is φ = 1165983984.

The previous prime is 1423121003. The next prime is 1423121041. The reversal of 1423121021 is 1201213241.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1423121021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423121041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 395396 + ... + 398978.

It is an arithmetic number, because the mean of its divisors is an integer number (106143744).

Almost surely, 2^1423121021 is an apocalyptic number.

It is an amenable number.

1423121021 is a deficient number, since it is larger than the sum of its proper divisors (275178883).

1423121021 is a wasteful number, since it uses less digits than its factorization.

1423121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6080.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1423121021 is about 37724.2762819911. The cubic root of 1423121021 is about 1124.8137360101.

Adding to 1423121021 its reverse (1201213241), we get a palindrome (2624334262).

The spelling of 1423121021 in words is "one billion, four hundred twenty-three million, one hundred twenty-one thousand, twenty-one".