2042234256721 has 4 divisors (see below), whose sum is σ = 2045420270244. Its totient is φ = 2039048243200.

The previous prime is 2042234256683. The next prime is 2042234256731. The reversal of 2042234256721 is 1276524322402.

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 1898578096321 + 143656160400 = 1377889^2 + 379020^2 .

It is a cyclic number.

It is not a de Polignac number, because 2042234256721 - 2¹¹ = 2042234254673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2042234256731) 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, 1593005800 + ... + 1593007081.

It is an arithmetic number, because the mean of its divisors is an integer number (511355067561).

Almost surely, 2^{2042234256721} is an apocalyptic number.

It is an amenable number.

2042234256721 is a deficient number, since it is larger than the sum of its proper divisors (3186013523).

2042234256721 is an equidigital number, since it uses as much as digits as its factorization.

2042234256721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3186013522.

The product of its (nonzero) digits is 322560, while the sum is 40.

The spelling of 2042234256721 in words is "two trillion, forty-two billion, two hundred thirty-four million, two hundred fifty-six thousand, seven hundred twenty-one".