211031421225 has 48 divisors (see below), whose sum is σ = 358418280000. Its totient is φ = 109482796800.

The previous prime is 211031421217. The next prime is 211031421247. The reversal of 211031421225 is 522124130112.

It is a happy number.

It is not a de Polignac number, because 211031421225 - 2³ = 211031421217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211031421195 and 211031421204.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20804655 + ... + 20814795.

It is an arithmetic number, because the mean of its divisors is an integer number (7467047500).

Almost surely, 2^211031421225 is an apocalyptic number.

211031421225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211031421225 is a deficient number, since it is larger than the sum of its proper divisors (147386858775).

211031421225 is a wasteful number, since it uses less digits than its factorization.

211031421225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17690 (or 17685 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 211031421225 its reverse (522124130112), we get a palindrome (733155551337).

The spelling of 211031421225 in words is "two hundred eleven billion, thirty-one million, four hundred twenty-one thousand, two hundred twenty-five".