212011001211981 has 16 divisors (see below), whose sum is σ = 300505431637440. Its totient is φ = 132575925715200.

The previous prime is 212011001211979. The next prime is 212011001212007. The reversal of 212011001211981 is 189112100110212.

It is not a de Polignac number, because 212011001211981 - 2¹ = 212011001211979 is a prime.

It is a super-2 number, since 2×212011001211981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212011001211781) 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, 18413317260 + ... + 18413328773.

It is an arithmetic number, because the mean of its divisors is an integer number (18781589477340).

Almost surely, 2^{212011001211981} is an apocalyptic number.

It is an amenable number.

212011001211981 is a deficient number, since it is larger than the sum of its proper divisors (88494430425459).

212011001211981 is a wasteful number, since it uses less digits than its factorization.

212011001211981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36826646156.

The product of its (nonzero) digits is 576, while the sum is 30.

The spelling of 212011001211981 in words is "two hundred twelve trillion, eleven billion, one million, two hundred eleven thousand, nine hundred eighty-one".