211225525421 has 4 divisors (see below), whose sum is σ = 212837934144. Its totient is φ = 209613116700.

The previous prime is 211225525369. The next prime is 211225525429. The reversal of 211225525421 is 124525522112.

211225525421 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211225525421 - 2¹⁴ = 211225509037 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 (211225525429) 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, 806204165 + ... + 806204426.

It is an arithmetic number, because the mean of its divisors is an integer number (53209483536).

Almost surely, 2^211225525421 is an apocalyptic number.

It is an amenable number.

211225525421 is a deficient number, since it is larger than the sum of its proper divisors (1612408723).

211225525421 is a wasteful number, since it uses less digits than its factorization.

211225525421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612408722.

The product of its digits is 16000, while the sum is 32.

The spelling of 211225525421 in words is "two hundred eleven billion, two hundred twenty-five million, five hundred twenty-five thousand, four hundred twenty-one".