22201851 has 24 divisors (see below), whose sum is σ = 34842960. Its totient is φ = 12536832.

The previous prime is 22201819. The next prime is 22201867. The reversal of 22201851 is 15810222.

It is a happy number.

It is not a de Polignac number, because 22201851 - 2⁵ = 22201819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (22201801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12235 + ... + 13931.

It is an arithmetic number, because the mean of its divisors is an integer number (1451790).

Almost surely, 2^22201851 is an apocalyptic number.

22201851 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

22201851 is a deficient number, since it is larger than the sum of its proper divisors (12641109).

22201851 is a wasteful number, since it uses less digits than its factorization.

22201851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803 (or 1796 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 22201851 is about 4711.8840180972. The cubic root of 22201851 is about 281.0582867316.

The spelling of 22201851 in words is "twenty-two million, two hundred one thousand, eight hundred fifty-one".