22292221 has 8 divisors (see below), whose sum is σ = 26584704. Its totient is φ = 18276720.

The previous prime is 22292201. The next prime is 22292239. The reversal of 22292221 is 12229222.

22292221 = T₄₉₈ + T₄₉₉ + ... + T₆₃₅.

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

It is not a de Polignac number, because 22292221 - 2¹³ = 22284029 is a prime.

It is a super-2 number, since 2×22292221² = 993886234225682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22292192 and 22292201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22292201) 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, 69070 + ... + 69391.

It is an arithmetic number, because the mean of its divisors is an integer number (3323088).

Almost surely, 2^22292221 is an apocalyptic number.

It is an amenable number.

22292221 is a deficient number, since it is larger than the sum of its proper divisors (4292483).

22292221 is a wasteful number, since it uses less digits than its factorization.

22292221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138491.

The product of its digits is 576, while the sum is 22.

The square root of 22292221 is about 4721.4638619818. The cubic root of 22292221 is about 281.4391086364.

The spelling of 22292221 in words is "twenty-two million, two hundred ninety-two thousand, two hundred twenty-one".