340505402021 has 4 divisors (see below), whose sum is σ = 340739749932. Its totient is φ = 340271054112.

The previous prime is 340505401979. The next prime is 340505402053. The reversal of 340505402021 is 120204505043.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 274088896225 + 66416505796 = 523535^2 + 257714^2 .

It is a cyclic number.

It is not a de Polignac number, because 340505402021 - 2¹⁴ = 340505385637 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 (340505402621) 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, 117171776 + ... + 117174681.

It is an arithmetic number, because the mean of its divisors is an integer number (85184937483).

Almost surely, 2^340505402021 is an apocalyptic number.

It is an amenable number.

340505402021 is a deficient number, since it is larger than the sum of its proper divisors (234347911).

340505402021 is a wasteful number, since it uses less digits than its factorization.

340505402021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234347910.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 340505402021 its reverse (120204505043), we get a palindrome (460709907064).

The spelling of 340505402021 in words is "three hundred forty billion, five hundred five million, four hundred two thousand, twenty-one".