211523404451 has 4 divisors (see below), whose sum is σ = 223965957672. Its totient is φ = 199080851232.

The previous prime is 211523404447. The next prime is 211523404489. The reversal of 211523404451 is 154404325112.

211523404451 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.

It is a cyclic number.

It is not a de Polignac number, because 211523404451 - 2² = 211523404447 is a prime.

It is a super-2 number, since 2×211523404451² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211523404441) 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, 6221276585 + ... + 6221276618.

It is an arithmetic number, because the mean of its divisors is an integer number (55991489418).

Almost surely, 2^211523404451 is an apocalyptic number.

211523404451 is a deficient number, since it is larger than the sum of its proper divisors (12442553221).

211523404451 is a wasteful number, since it uses less digits than its factorization.

211523404451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12442553220.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 211523404451 its reverse (154404325112), we get a palindrome (365927729563).

The spelling of 211523404451 in words is "two hundred eleven billion, five hundred twenty-three million, four hundred four thousand, four hundred fifty-one".