212729956981 has 4 divisors (see below), whose sum is σ = 212760763072. Its totient is φ = 212699150892.

The previous prime is 212729956891. The next prime is 212729956991. The reversal of 212729956981 is 189659927212.

212729956981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212729956981 - 2¹³ = 212729948789 is a prime.

It is a super-2 number, since 2×212729956981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212729956991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15392685 + ... + 15406498.

It is an arithmetic number, because the mean of its divisors is an integer number (53190190768).

Almost surely, 2^212729956981 is an apocalyptic number.

It is an amenable number.

212729956981 is a deficient number, since it is larger than the sum of its proper divisors (30806091).

212729956981 is an equidigital number, since it uses as much as digits as its factorization.

212729956981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30806090.

The product of its digits is 9797760, while the sum is 61.

The spelling of 212729956981 in words is "two hundred twelve billion, seven hundred twenty-nine million, nine hundred fifty-six thousand, nine hundred eighty-one".