22154212 has 24 divisors (see below), whose sum is σ = 40787712. Its totient is φ = 10514400.

The previous prime is 22154203. The next prime is 22154233. The reversal of 22154212 is 21245122.

It is a self number, because there is not a number n which added to its sum of digits gives 22154212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4887 + ... + 8257.

It is an arithmetic number, because the mean of its divisors is an integer number (1699488).

Almost surely, 2^22154212 is an apocalyptic number.

It is an amenable number.

22154212 is a deficient number, since it is larger than the sum of its proper divisors (18633500).

22154212 is a wasteful number, since it uses less digits than its factorization.

22154212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3459 (or 3457 counting only the distinct ones).

The product of its digits is 320, while the sum is 19.

The square root of 22154212 is about 4706.8261068368. The cubic root of 22154212 is about 280.8571184634.

Adding to 22154212 its reverse (21245122), we get a palindrome (43399334).

It can be divided in two parts, 22154 and 212, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 22154212 in words is "twenty-two million, one hundred fifty-four thousand, two hundred twelve".