212521078 has 16 divisors (see below), whose sum is σ = 397442304. Its totient is φ = 82800360.

The previous prime is 212521073. The next prime is 212521079. The reversal of 212521078 is 870125212.

212521078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212521073) 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, 689850 + ... + 690157.

It is an arithmetic number, because the mean of its divisors is an integer number (24840144).

Almost surely, 2^212521078 is an apocalyptic number.

212521078 is a deficient number, since it is larger than the sum of its proper divisors (184921226).

212521078 is a wasteful number, since it uses less digits than its factorization.

212521078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380027.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 212521078 is about 14578.1026886217. The cubic root of 212521078 is about 596.7613256947.

The spelling of 212521078 in words is "two hundred twelve million, five hundred twenty-one thousand, seventy-eight".