402342500621 has 4 divisors (see below), whose sum is σ = 402514960092. Its totient is φ = 402170041152.

The previous prime is 402342500591. The next prime is 402342500641. The reversal of 402342500621 is 126005243204.

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 76314062500 + 326028438121 = 276250^2 + 570989^2 .

It is a cyclic number.

It is not a de Polignac number, because 402342500621 - 2¹⁸ = 402342238477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402342500641) 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, 86226236 + ... + 86230901.

It is an arithmetic number, because the mean of its divisors is an integer number (100628740023).

Almost surely, 2^402342500621 is an apocalyptic number.

It is an amenable number.

402342500621 is a deficient number, since it is larger than the sum of its proper divisors (172459471).

402342500621 is a wasteful number, since it uses less digits than its factorization.

402342500621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172459470.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 402342500621 its reverse (126005243204), we get a palindrome (528347743825).

The spelling of 402342500621 in words is "four hundred two billion, three hundred forty-two million, five hundred thousand, six hundred twenty-one".