212345205490 has 16 divisors (see below), whose sum is σ = 416968767360. Its totient is φ = 77216438320.

The previous prime is 212345205407. The next prime is 212345205491. The reversal of 212345205490 is 94502543212.

It is a super-2 number, since 2×212345205490² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212345205491) 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, 965205370 + ... + 965205589.

It is an arithmetic number, because the mean of its divisors is an integer number (26060547960).

Almost surely, 2^212345205490 is an apocalyptic number.

212345205490 is a deficient number, since it is larger than the sum of its proper divisors (204623561870).

212345205490 is a wasteful number, since it uses less digits than its factorization.

212345205490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930410977.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 212345205490 in words is "two hundred twelve billion, three hundred forty-five million, two hundred five thousand, four hundred ninety".