211031421 has 8 divisors (see below), whose sum is σ = 297926784. Its totient is φ = 132411840.

The previous prime is 211031419. The next prime is 211031453. The reversal of 211031421 is 124130112.

211031421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211031421 - 2¹ = 211031419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211031421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211031221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2068885 + ... + 2068986.

It is an arithmetic number, because the mean of its divisors is an integer number (37240848).

Almost surely, 2^211031421 is an apocalyptic number.

It is an amenable number.

211031421 is a deficient number, since it is larger than the sum of its proper divisors (86895363).

211031421 is a wasteful number, since it uses less digits than its factorization.

211031421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4137891.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 211031421 is about 14526.9205614955. The cubic root of 211031421 is about 595.3637311826.

Adding to 211031421 its reverse (124130112), we get a palindrome (335161533).

The spelling of 211031421 in words is "two hundred eleven million, thirty-one thousand, four hundred twenty-one".