212861370 has 64 divisors (see below), whose sum is σ = 552343680. Its totient is φ = 52316928.

The previous prime is 212861353. The next prime is 212861387. The reversal of 212861370 is 73168212.

It is an interprime number because it is at equal distance from previous prime (212861353) and next prime (212861387).

It is a Harshad number since it is a multiple of its sum of digits (30).

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 31 ways as a sum of consecutive naturals, for example, 16044 + ... + 26136.

It is an arithmetic number, because the mean of its divisors is an integer number (8630370).

Almost surely, 2^212861370 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212861370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276171840).

212861370 is an abundant number, since it is smaller than the sum of its proper divisors (339482310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212861370 is a wasteful number, since it uses less digits than its factorization.

212861370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10159.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 212861370 is about 14589.7693607541. The cubic root of 212861370 is about 597.0796702958.

The spelling of 212861370 in words is "two hundred twelve million, eight hundred sixty-one thousand, three hundred seventy".