2651722021 has 8 divisors (see below), whose sum is σ = 2857478624. Its totient is φ = 2446219440.

The previous prime is 2651722013. The next prime is 2651722037. The reversal of 2651722021 is 1202271562.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2651722021 - 2³ = 2651722013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2651722001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41535 + ... + 83836.

It is an arithmetic number, because the mean of its divisors is an integer number (357184828).

Almost surely, 2^2651722021 is an apocalyptic number.

It is an amenable number.

2651722021 is a deficient number, since it is larger than the sum of its proper divisors (205756603).

2651722021 is a wasteful number, since it uses less digits than its factorization.

2651722021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127011.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 2651722021 is about 51494.8737351593. The cubic root of 2651722021 is about 1384.1271846557.

Adding to 2651722021 its reverse (1202271562), we get a palindrome (3853993583).

The spelling of 2651722021 in words is "two billion, six hundred fifty-one million, seven hundred twenty-two thousand, twenty-one".