212022542 has 4 divisors (see below), whose sum is σ = 318033816. Its totient is φ = 106011270.

The previous prime is 212022529. The next prime is 212022557. The reversal of 212022542 is 245220212.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×212022542² = 89907116632283528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53005634 + ... + 53005637.

It is an arithmetic number, because the mean of its divisors is an integer number (79508454).

Almost surely, 2^212022542 is an apocalyptic number.

212022542 is a deficient number, since it is larger than the sum of its proper divisors (106011274).

212022542 is a wasteful number, since it uses less digits than its factorization.

212022542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106011273.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 212022542 is about 14560.9938534428. The cubic root of 212022542 is about 596.2943289725.

Adding to 212022542 its reverse (245220212), we get a palindrome (457242754).

The spelling of 212022542 in words is "two hundred twelve million, twenty-two thousand, five hundred forty-two".