212261428 has 12 divisors (see below), whose sum is σ = 380517732. Its totient is φ = 103542080.

The previous prime is 212261389. The next prime is 212261531. The reversal of 212261428 is 824162212.

212261428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 93276964 + 118984464 = 9658^2 + 10908^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212261396 and 212261405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 646975 + ... + 647302.

It is an arithmetic number, because the mean of its divisors is an integer number (31709811).

Almost surely, 2^212261428 is an apocalyptic number.

It is an amenable number.

212261428 is a deficient number, since it is larger than the sum of its proper divisors (168256304).

212261428 is a wasteful number, since it uses less digits than its factorization.

212261428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294322 (or 1294320 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 212261428 is about 14569.1944869989. The cubic root of 212261428 is about 596.5181933802.

The spelling of 212261428 in words is "two hundred twelve million, two hundred sixty-one thousand, four hundred twenty-eight".