2772021 has 8 divisors (see below), whose sum is σ = 4224064. Its totient is φ = 1584000.

The previous prime is 2772019. The next prime is 2772041. The reversal of 2772021 is 1202772.

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

It is not a de Polignac number, because 2772021 - 2¹ = 2772019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 132001 = 2772021 / (2 + 7 + 7 + 2 + 0 + 2 + 1).

It is a Duffinian number.

2772021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2772041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65980 + ... + 66021.

It is an arithmetic number, because the mean of its divisors is an integer number (528008).

2^2772021 is an apocalyptic number.

2772021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2772021 is a deficient number, since it is larger than the sum of its proper divisors (1452043).

2772021 is a wasteful number, since it uses less digits than its factorization.

2772021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132011.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 2772021 is about 1664.9387376117. The cubic root of 2772021 is about 140.4749346335.

Adding to 2772021 its reverse (1202772), we get a palindrome (3974793).

The spelling of 2772021 in words is "two million, seven hundred seventy-two thousand, twenty-one".