212891979443 has 16 divisors (see below), whose sum is σ = 251406800736. Its totient is φ = 177724938240.

The previous prime is 212891979439. The next prime is 212891979499. The reversal of 212891979443 is 344979198212.

It is a cyclic number.

It is not a de Polignac number, because 212891979443 - 2² = 212891979439 is a prime.

It is a super-2 number, since 2×212891979443² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212891979413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3829280 + ... + 3884477.

It is an arithmetic number, because the mean of its divisors is an integer number (15712925046).

Almost surely, 2^212891979443 is an apocalyptic number.

212891979443 is a deficient number, since it is larger than the sum of its proper divisors (38514821293).

212891979443 is a wasteful number, since it uses less digits than its factorization.

212891979443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7713974.

The product of its digits is 7838208, while the sum is 59.

The spelling of 212891979443 in words is "two hundred twelve billion, eight hundred ninety-one million, nine hundred seventy-nine thousand, four hundred forty-three".