1421505023 has 4 divisors (see below), whose sum is σ = 1428870528. Its totient is φ = 1414139520.

The previous prime is 1421505017. The next prime is 1421505037. The reversal of 1421505023 is 3205051241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1421505023 - 2¹⁴ = 1421488639 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 1421505023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421505053) 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, 3682463 + ... + 3682848.

It is an arithmetic number, because the mean of its divisors is an integer number (357217632).

Almost surely, 2^1421505023 is an apocalyptic number.

1421505023 is a deficient number, since it is larger than the sum of its proper divisors (7365505).

1421505023 is an equidigital number, since it uses as much as digits as its factorization.

1421505023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7365504.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1421505023 is about 37702.8516560750. The cubic root of 1421505023 is about 1124.3878211436.

Adding to 1421505023 its reverse (3205051241), we get a palindrome (4626556264).

The spelling of 1421505023 in words is "one billion, four hundred twenty-one million, five hundred five thousand, twenty-three".