340251722721 has 27 divisors (see below), whose sum is σ = 495698836113. Its totient is φ = 224901389160.

The previous prime is 340251722677. The next prime is 340251722777. The reversal of 340251722721 is 127227152043.

The square root of 340251722721 is 583311.

It is a perfect power (a square), and thus also a powerful number.

340251722721 is a `hidden beast` number, since 3 + 402 + 5 + 1 + 7 + 227 + 21 = 666.

It is not a de Polignac number, because 340251722721 - 2³¹ = 338104239073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (340251722021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 222240726 + ... + 222242256.

Almost surely, 2^340251722721 is an apocalyptic number.

340251722721 is the 583311-st square number.

340251722721 is the 291656-th centered octagonal number.

It is an amenable number.

340251722721 is a deficient number, since it is larger than the sum of its proper divisors (155447113392).

340251722721 is an frugal number, since it uses more digits than its factorization.

340251722721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322 (or 1661 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

Multiplying 340251722721 by its sum of digits (36), we get a square (12249062017956 = 3499866²).

Adding to 340251722721 its reverse (127227152043), we get a palindrome (467478874764).

The spelling of 340251722721 in words is "three hundred forty billion, two hundred fifty-one million, seven hundred twenty-two thousand, seven hundred twenty-one".