211225668861 has 8 divisors (see below), whose sum is σ = 283851817984. Its totient is φ = 139708316160.

The previous prime is 211225668853. The next prime is 211225668869. The reversal of 211225668861 is 168866522112.

It is an interprime number because it is at equal distance from previous prime (211225668853) and next prime (211225668869).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211225668861 - 2³ = 211225668853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211225668861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211225668869) 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, 277198660 + ... + 277199421.

It is an arithmetic number, because the mean of its divisors is an integer number (35481477248).

Almost surely, 2^211225668861 is an apocalyptic number.

It is an amenable number.

211225668861 is a deficient number, since it is larger than the sum of its proper divisors (72626149123).

211225668861 is a wasteful number, since it uses less digits than its factorization.

211225668861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554398211.

The product of its digits is 552960, while the sum is 48.

The spelling of 211225668861 in words is "two hundred eleven billion, two hundred twenty-five million, six hundred sixty-eight thousand, eight hundred sixty-one".