211442405251 has 16 divisors (see below), whose sum is σ = 263630718720. Its totient is φ = 164751432480.

The previous prime is 211442405227. The next prime is 211442405257. The reversal of 211442405251 is 152504244112.

It is a cyclic number.

It is not a de Polignac number, because 211442405251 - 2⁹ = 211442404739 is a prime.

It is a super-2 number, since 2×211442405251² (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 (211442405257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1610745 + ... + 1737061.

It is an arithmetic number, because the mean of its divisors is an integer number (16476919920).

Almost surely, 2^211442405251 is an apocalyptic number.

211442405251 is a deficient number, since it is larger than the sum of its proper divisors (52188313469).

211442405251 is a wasteful number, since it uses less digits than its factorization.

211442405251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148074.

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 211442405251 its reverse (152504244112), we get a palindrome (363946649363).

The spelling of 211442405251 in words is "two hundred eleven billion, four hundred forty-two million, four hundred five thousand, two hundred fifty-one".