1345555421 has 16 divisors (see below), whose sum is σ = 1553472000. Its totient is φ = 1141623168.

The previous prime is 1345555411. The next prime is 1345555429. The reversal of 1345555421 is 1245555431.

It is a de Polignac number, because none of the positive numbers 2^k-1345555421 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 (1345555429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287105 + ... + 291753.

It is an arithmetic number, because the mean of its divisors is an integer number (97092000).

Almost surely, 2^1345555421 is an apocalyptic number.

It is an amenable number.

1345555421 is a deficient number, since it is larger than the sum of its proper divisors (207916579).

1345555421 is a wasteful number, since it uses less digits than its factorization.

1345555421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5068.

The product of its digits is 60000, while the sum is 35.

The square root of 1345555421 is about 36681.8132185420. The cubic root of 1345555421 is about 1103.9952295027.

It can be divided in two parts, 134 and 5555421, that added together give a palindrome (5555555).

The spelling of 1345555421 in words is "one billion, three hundred forty-five million, five hundred fifty-five thousand, four hundred twenty-one".