212220837 has 8 divisors (see below), whose sum is σ = 314401280. Its totient is φ = 141480540.

The previous prime is 212220787. The next prime is 212220857. The reversal of 212220837 is 738022212.

It is a happy number.

It is not a de Polignac number, because 212220837 - 2⁶ = 212220773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 7860031 = 212220837 / (2 + 1 + 2 + 2 + 2 + 0 + 8 + 3 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212220837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212220857) 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, 3929989 + ... + 3930042.

It is an arithmetic number, because the mean of its divisors is an integer number (39300160).

Almost surely, 2^212220837 is an apocalyptic number.

212220837 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

212220837 is a deficient number, since it is larger than the sum of its proper divisors (102180443).

212220837 is an equidigital number, since it uses as much as digits as its factorization.

212220837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7860040 (or 7860034 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 212220837 is about 14567.8013783824. The cubic root of 212220837 is about 596.4801666666.

The spelling of 212220837 in words is "two hundred twelve million, two hundred twenty thousand, eight hundred thirty-seven".