1345125021 has 8 divisors (see below), whose sum is σ = 1816202880. Its totient is φ = 885398592.

The previous prime is 1345125013. The next prime is 1345125037. The reversal of 1345125021 is 1205215431.

It is a happy number.

1345125021 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1345125021 - 2³ = 1345125013 is a prime.

It is a super-2 number, since 2×1345125021² = 3618722644240500882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1345124982 and 1345125000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345126021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2837580 + ... + 2838053.

It is an arithmetic number, because the mean of its divisors is an integer number (227025360).

Almost surely, 2^1345125021 is an apocalyptic number.

It is an amenable number.

1345125021 is a deficient number, since it is larger than the sum of its proper divisors (471077859).

1345125021 is an equidigital number, since it uses as much as digits as its factorization.

1345125021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5675715.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1345125021 is about 36675.9460818668. The cubic root of 1345125021 is about 1103.8775060677.

The spelling of 1345125021 in words is "one billion, three hundred forty-five million, one hundred twenty-five thousand, twenty-one".