211313501125551 has 80 divisors (see below), whose sum is σ = 346296606784128. Its totient is φ = 127349711006400.

The previous prime is 211313501125543. The next prime is 211313501125631. The reversal of 211313501125551 is 155521105313112.

211313501125551 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 1 + 350 + 1 + 1 + 255 + 51 = 666.

It is not a de Polignac number, because 211313501125551 - 2³ = 211313501125543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211313501125651) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1991159976 + ... + 1991266098.

Almost surely, 2^{211313501125551} is an apocalyptic number.

211313501125551 is a deficient number, since it is larger than the sum of its proper divisors (134983105658577).

211313501125551 is a wasteful number, since it uses less digits than its factorization.

211313501125551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118674 (or 118665 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

Adding to 211313501125551 its reverse (155521105313112), we get a palindrome (366834606438663).

The spelling of 211313501125551 in words is "two hundred eleven trillion, three hundred thirteen billion, five hundred one million, one hundred twenty-five thousand, five hundred fifty-one".