212121012 has 12 divisors (see below), whose sum is σ = 494949056. Its totient is φ = 70707000.

The previous prime is 212120983. The next prime is 212121023. The reversal of 212121012 is 210121212.

212121012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

212121012 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×212121012³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 17676751 = 212121012 / (2 + 1 + 2 + 1 + 2 + 1 + 0 + 1 + 2).

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

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, 8838364 + ... + 8838387.

Almost surely, 2^212121012 is an apocalyptic number.

It is an amenable number.

212121012 is an abundant number, since it is smaller than the sum of its proper divisors (282828044).

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

212121012 is a wasteful number, since it uses less digits than its factorization.

212121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17676758 (or 17676756 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 212121012 is about 14564.3747548599. The cubic root of 212121012 is about 596.3866273579.

Adding to 212121012 its reverse (210121212), we get a palindrome (422242224).

The spelling of 212121012 in words is "two hundred twelve million, one hundred twenty-one thousand, twelve".