1345421020 has 24 divisors (see below), whose sum is σ = 2852819424. Its totient is φ = 532942656.

The previous prime is 1345421017. The next prime is 1345421039. The reversal of 1345421020 is 201245431.

It is a junction number, because it is equal to n+sod(n) for n = 1345420982 and 1345421000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324499 + ... + 328618.

It is an arithmetic number, because the mean of its divisors is an integer number (118867476).

Almost surely, 2^1345421020 is an apocalyptic number.

1345421020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1345421020 is an abundant number, since it is smaller than the sum of its proper divisors (1507398404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1345421020 is a wasteful number, since it uses less digits than its factorization.

1345421020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653229 (or 653227 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1345421020 is about 36679.9811886538. The cubic root of 1345421020 is about 1103.9584707038.

Adding to 1345421020 its reverse (201245431), we get a palindrome (1546666451).

The spelling of 1345421020 in words is "one billion, three hundred forty-five million, four hundred twenty-one thousand, twenty".