212421145 has 8 divisors (see below), whose sum is σ = 263128320. Its totient is φ = 164454960.

The previous prime is 212421119. The next prime is 212421149. The reversal of 212421145 is 541124212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212421145 - 2⁵ = 212421113 is a prime.

It is a super-2 number, since 2×212421145² = 90245485686222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212421149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 685075 + ... + 685384.

It is an arithmetic number, because the mean of its divisors is an integer number (32891040).

Almost surely, 2^212421145 is an apocalyptic number.

It is an amenable number.

212421145 is a deficient number, since it is larger than the sum of its proper divisors (50707175).

212421145 is a wasteful number, since it uses less digits than its factorization.

212421145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370495.

The product of its digits is 640, while the sum is 22.

The square root of 212421145 is about 14574.6747819634. The cubic root of 212421145 is about 596.6677734063.

Adding to 212421145 its reverse (541124212), we get a palindrome (753545357).

The spelling of 212421145 in words is "two hundred twelve million, four hundred twenty-one thousand, one hundred forty-five".