212400042 has 16 divisors (see below), whose sum is σ = 425019360. Its totient is φ = 70763472.

The previous prime is 212400037. The next prime is 212400077. The reversal of 212400042 is 240004212.

It is a super-2 number, since 2×212400042² = 90227555683203528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212399994 and 212400030.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5184 + ... + 21252.

It is an arithmetic number, because the mean of its divisors is an integer number (26563710).

Almost surely, 2^212400042 is an apocalyptic number.

212400042 is an abundant number, since it is smaller than the sum of its proper divisors (212619318).

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

212400042 is a wasteful number, since it uses less digits than its factorization.

212400042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18277.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 212400042 is about 14573.9508027165. The cubic root of 212400042 is about 596.6480140787.

Adding to 212400042 its reverse (240004212), we get a palindrome (452404254).

The spelling of 212400042 in words is "two hundred twelve million, four hundred thousand, forty-two".