27722421 has 6 divisors (see below), whose sum is σ = 40043510. Its totient is φ = 18481608.

The previous prime is 27722419. The next prime is 27722423. The reversal of 27722421 is 12422772.

It is an interprime number because it is at equal distance from previous prime (27722419) and next prime (27722423).

It can be written as a sum of positive squares in only one way, i.e., 24059025 + 3663396 = 4905^2 + 1914^2 .

It is not a de Polignac number, because 27722421 - 2¹ = 27722419 is a prime.

It is a super-2 number, since 2×27722421² = 1537065252202482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27722423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1540126 + ... + 1540143.

Almost surely, 2^27722421 is an apocalyptic number.

It is an amenable number.

27722421 is a deficient number, since it is larger than the sum of its proper divisors (12321089).

27722421 is a wasteful number, since it uses less digits than its factorization.

27722421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080275 (or 3080272 counting only the distinct ones).

The product of its digits is 3136, while the sum is 27.

The square root of 27722421 is about 5265.2085428784. The cubic root of 27722421 is about 302.6521184688.

The spelling of 27722421 in words is "twenty-seven million, seven hundred twenty-two thousand, four hundred twenty-one".