345052690421 has 4 divisors (see below), whose sum is σ = 345076304844. Its totient is φ = 345029076000.

The previous prime is 345052690399. The next prime is 345052690427. The reversal of 345052690421 is 124096250543.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124096250543 = 61 ⋅2034364763.

It can be written as a sum of positive squares in 2 ways, for example, as 156092947396 + 188959743025 = 395086^2 + 434695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345052690421 is a prime.

It is a super-2 number, since 2×345052690421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345052690427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11785280 + ... + 11814521.

It is an arithmetic number, because the mean of its divisors is an integer number (86269076211).

Almost surely, 2^345052690421 is an apocalyptic number.

It is an amenable number.

345052690421 is a deficient number, since it is larger than the sum of its proper divisors (23614423).

345052690421 is a wasteful number, since it uses less digits than its factorization.

345052690421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23614422.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 345052690421 in words is "three hundred forty-five billion, fifty-two million, six hundred ninety thousand, four hundred twenty-one".