1421211439 has 4 divisors (see below), whose sum is σ = 1470218760. Its totient is φ = 1372204120.

The previous prime is 1421211431. The next prime is 1421211479. The reversal of 1421211439 is 9341121241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9341121241 = 29 ⋅322107629.

It is a cyclic number.

It is not a de Polignac number, because 1421211439 - 2³ = 1421211431 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 (1421211431) 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, 24503617 + ... + 24503674.

It is an arithmetic number, because the mean of its divisors is an integer number (367554690).

Almost surely, 2^1421211439 is an apocalyptic number.

1421211439 is a deficient number, since it is larger than the sum of its proper divisors (49007321).

1421211439 is an equidigital number, since it uses as much as digits as its factorization.

1421211439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49007320.

The product of its digits is 1728, while the sum is 28.

The square root of 1421211439 is about 37698.9580625248. The cubic root of 1421211439 is about 1124.3104090588.

It can be divided in two parts, 14212 and 11439, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 1421211439 in words is "one billion, four hundred twenty-one million, two hundred eleven thousand, four hundred thirty-nine".