22270987 has 2 divisors, whose sum is σ = 22270988. Its totient is φ = 22270986.

The previous prime is 22270967. The next prime is 22270991. The reversal of 22270987 is 78907222.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22270987 is a prime.

It is not a weakly prime, because it can be changed into another prime (22270957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11135493 + 11135494.

It is an arithmetic number, because the mean of its divisors is an integer number (11135494).

Almost surely, 2^22270987 is an apocalyptic number.

22270987 is a deficient number, since it is larger than the sum of its proper divisors (1).

22270987 is an equidigital number, since it uses as much as digits as its factorization.

22270987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 22270987 is about 4719.2146592415. The cubic root of 22270987 is about 281.3497205564.

It can be divided in two parts, 2227098 and 7, that added together give a triangular number (2227105 = T₂₁₁₀).

The spelling of 22270987 in words is "twenty-two million, two hundred seventy thousand, nine hundred eighty-seven".