212105055651 has 4 divisors (see below), whose sum is σ = 282806740872. Its totient is φ = 141403370432.

The previous prime is 212105055647. The next prime is 212105055661. The reversal of 212105055651 is 156550501212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212105055651 - 2² = 212105055647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212105055661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35350842606 + ... + 35350842611.

It is an arithmetic number, because the mean of its divisors is an integer number (70701685218).

Almost surely, 2^212105055651 is an apocalyptic number.

212105055651 is a deficient number, since it is larger than the sum of its proper divisors (70701685221).

212105055651 is an equidigital number, since it uses as much as digits as its factorization.

212105055651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70701685220.

The product of its (nonzero) digits is 15000, while the sum is 33.

Adding to 212105055651 its reverse (156550501212), we get a palindrome (368655556863).

The spelling of 212105055651 in words is "two hundred twelve billion, one hundred five million, fifty-five thousand, six hundred fifty-one".