1421513231 has 4 divisors (see below), whose sum is σ = 1422124872. Its totient is φ = 1420901592.

The previous prime is 1421513209. The next prime is 1421513237. The reversal of 1421513231 is 1323151241.

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 1421513231 - 2¹⁸ = 1421251087 is a prime.

It is a super-2 number, since 2×1421513231² = 4041399731816118722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1421513197 and 1421513206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421513237) 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, 302321 + ... + 306986.

It is an arithmetic number, because the mean of its divisors is an integer number (355531218).

Almost surely, 2^1421513231 is an apocalyptic number.

1421513231 is a deficient number, since it is larger than the sum of its proper divisors (611641).

1421513231 is an equidigital number, since it uses as much as digits as its factorization.

1421513231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611640.

The product of its digits is 720, while the sum is 23.

The square root of 1421513231 is about 37702.9605071008. The cubic root of 1421513231 is about 1124.3899852718.

Adding to 1421513231 its reverse (1323151241), we get a palindrome (2744664472).

The spelling of 1421513231 in words is "one billion, four hundred twenty-one million, five hundred thirteen thousand, two hundred thirty-one".