2002773721 has 4 divisors (see below), whose sum is σ = 2156833252. Its totient is φ = 1848714192.

The previous prime is 2002773713. The next prime is 2002773733. The reversal of 2002773721 is 1273772002.

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 150332121 + 1852441600 = 12261^2 + 43040^2 .

It is not a de Polignac number, because 2002773721 - 2³ = 2002773713 is a prime.

It is a super-2 number, since 2×2002773721² = 8022205155056371682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2002773121) 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, 77029746 + ... + 77029771.

It is an arithmetic number, because the mean of its divisors is an integer number (539208313).

Almost surely, 2^2002773721 is an apocalyptic number.

It is an amenable number.

2002773721 is a deficient number, since it is larger than the sum of its proper divisors (154059531).

2002773721 is a wasteful number, since it uses less digits than its factorization.

2002773721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154059530.

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 2002773721 is about 44752.3599489457. The cubic root of 2002773721 is about 1260.5032257579.

The spelling of 2002773721 in words is "two billion, two million, seven hundred seventy-three thousand, seven hundred twenty-one".