22256421 has 16 divisors (see below), whose sum is σ = 32514048. Its totient is φ = 13430000.

The previous prime is 22256411. The next prime is 22256431. The reversal of 22256421 is 12465222.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22256411) and next prime (22256431).

It is a cyclic number.

It is not a de Polignac number, because 22256421 - 2⁷ = 22256293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22256391 and 22256400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22256401) 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 15 ways as a sum of consecutive naturals, for example, 6940 + ... + 9626.

It is an arithmetic number, because the mean of its divisors is an integer number (2032128).

Almost surely, 2^22256421 is an apocalyptic number.

It is an amenable number.

22256421 is a deficient number, since it is larger than the sum of its proper divisors (10257627).

22256421 is a wasteful number, since it uses less digits than its factorization.

22256421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2952.

The product of its digits is 1920, while the sum is 24.

The square root of 22256421 is about 4717.6711415697. The cubic root of 22256421 is about 281.2883696787.

It can be divided in two parts, 2225 and 6421, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 22256421 in words is "twenty-two million, two hundred fifty-six thousand, four hundred twenty-one".