212403444 has 48 divisors (see below), whose sum is σ = 558114816. Its totient is φ = 62287200.

The previous prime is 212403439. The next prime is 212403463. The reversal of 212403444 is 444304212.

It is a happy number.

It is a super-2 number, since 2×212403444² = 90230446046122272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21862 + ... + 30045.

It is an arithmetic number, because the mean of its divisors is an integer number (11627392).

Almost surely, 2^212403444 is an apocalyptic number.

It is an amenable number.

212403444 is an abundant number, since it is smaller than the sum of its proper divisors (345711372).

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

212403444 is a wasteful number, since it uses less digits than its factorization.

212403444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51956 (or 51954 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 212403444 is about 14574.0675173405. The cubic root of 212403444 is about 596.6511995547.

Adding to 212403444 its reverse (444304212), we get a palindrome (656707656).

It can be divided in two parts, 21240 and 3444, that multiplied together give a triangular number (73150560 = T₁₂₀₉₅).

The spelling of 212403444 in words is "two hundred twelve million, four hundred three thousand, four hundred forty-four".