211123025551 has 4 divisors (see below), whose sum is σ = 223542027072. Its totient is φ = 198704024032.

The previous prime is 211123025537. The next prime is 211123025621. The reversal of 211123025551 is 155520321112.

It is a happy number.

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 211123025551 - 2⁹ = 211123025039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211123025501) 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, 6209500735 + ... + 6209500768.

It is an arithmetic number, because the mean of its divisors is an integer number (55885506768).

Almost surely, 2^211123025551 is an apocalyptic number.

211123025551 is a deficient number, since it is larger than the sum of its proper divisors (12419001521).

211123025551 is a wasteful number, since it uses less digits than its factorization.

211123025551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12419001520.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 211123025551 its reverse (155520321112), we get a palindrome (366643346663).

The spelling of 211123025551 in words is "two hundred eleven billion, one hundred twenty-three million, twenty-five thousand, five hundred fifty-one".