212421403 has 16 divisors (see below), whose sum is σ = 224078400. Its totient is φ = 201142656.

The previous prime is 212421389. The next prime is 212421431. The reversal of 212421403 is 304124212.

212421403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212421403 - 2⁵ = 212421371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212421203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291826 + ... + 292552.

It is an arithmetic number, because the mean of its divisors is an integer number (14004900).

Almost surely, 2^212421403 is an apocalyptic number.

212421403 is a deficient number, since it is larger than the sum of its proper divisors (11656997).

212421403 is a wasteful number, since it uses less digits than its factorization.

212421403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 212421403 is about 14574.6836329301. The cubic root of 212421403 is about 596.6680149708.

Adding to 212421403 its reverse (304124212), we get a palindrome (516545615).

The spelling of 212421403 in words is "two hundred twelve million, four hundred twenty-one thousand, four hundred three".