1245885421 has 4 divisors (see below), whose sum is σ = 1359147744. Its totient is φ = 1132623100.

The previous prime is 1245885401. The next prime is 1245885439.

1245885421 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245885421 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 (1245885401) 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, 56631145 + ... + 56631166.

It is an arithmetic number, because the mean of its divisors is an integer number (339786936).

Almost surely, 2^1245885421 is an apocalyptic number.

1245885421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1245885421 is a deficient number, since it is larger than the sum of its proper divisors (113262323).

1245885421 is a wasteful number, since it uses less digits than its factorization.

1245885421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113262322.

The product of its digits is 102400, while the sum is 40.

The square root of 1245885421 is about 35297.1021615090. The cubic root of 1245885421 is about 1076.0341002193.

It can be divided in two parts, 12458 and 85421, that added together give a palindrome (97879).

The spelling of 1245885421 in words is "one billion, two hundred forty-five million, eight hundred eighty-five thousand, four hundred twenty-one".