212420993 has 4 divisors (see below), whose sum is σ = 212583360. Its totient is φ = 212258628.

The previous prime is 212420983. The next prime is 212421019. The reversal of 212420993 is 399024212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212420993 - 2⁴ = 212420977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212420983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79205 + ... + 81842.

It is an arithmetic number, because the mean of its divisors is an integer number (53145840).

Almost surely, 2^212420993 is an apocalyptic number.

It is an amenable number.

212420993 is a deficient number, since it is larger than the sum of its proper divisors (162367).

212420993 is a wasteful number, since it uses less digits than its factorization.

212420993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162366.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 212420993 is about 14574.6695674379. The cubic root of 212420993 is about 596.6676310892.

The spelling of 212420993 in words is "two hundred twelve million, four hundred twenty thousand, nine hundred ninety-three".