212071492890 has 96 divisors (see below), whose sum is σ = 570090128400. Its totient is φ = 54654538752.

The previous prime is 212071492889. The next prime is 212071492949. The reversal of 212071492890 is 98294170212.

212071492890 is a `hidden beast` number, since 2 + 1 + 2 + 0 + 71 + 492 + 8 + 90 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 103849574049 + 108221918841 = 322257^2 + 328971^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 282462 + ... + 709878.

Almost surely, 2^212071492890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212071492890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285045064200).

212071492890 is an abundant number, since it is smaller than the sum of its proper divisors (358018635510).

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

212071492890 is a wasteful number, since it uses less digits than its factorization.

212071492890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427616 (or 427613 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 212071492890 in words is "two hundred twelve billion, seventy-one million, four hundred ninety-two thousand, eight hundred ninety".