1421238506243 has 4 divisors (see below), whose sum is σ = 1421498288448. Its totient is φ = 1420978724040.

The previous prime is 1421238506221. The next prime is 1421238506339. The reversal of 1421238506243 is 3426058321241.

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 1421238506243 - 2¹⁴ = 1421238489859 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 1421238506243.

It is not an unprimeable number, because it can be changed into a prime (1421238206243) 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, 129882896 + ... + 129893837.

It is an arithmetic number, because the mean of its divisors is an integer number (355374572112).

Almost surely, 2^{1421238506243} is an apocalyptic number.

1421238506243 is a deficient number, since it is larger than the sum of its proper divisors (259782205).

1421238506243 is an equidigital number, since it uses as much as digits as its factorization.

1421238506243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259782204.

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 1421238506243 in words is "one trillion, four hundred twenty-one billion, two hundred thirty-eight million, five hundred six thousand, two hundred forty-three".