211037421 has 32 divisors (see below), whose sum is σ = 332400640. Its totient is φ = 116593344.

The previous prime is 211037417. The next prime is 211037461. The reversal of 211037421 is 124730112.

211037421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211037421 - 2² = 211037417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211037401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91875 + ... + 94143.

It is an arithmetic number, because the mean of its divisors is an integer number (10387520).

Almost surely, 2^211037421 is an apocalyptic number.

211037421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211037421 is a deficient number, since it is larger than the sum of its proper divisors (121363219).

211037421 is a wasteful number, since it uses less digits than its factorization.

211037421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 211037421 is about 14527.1270731690. The cubic root of 211037421 is about 595.3693735470.

Adding to 211037421 its reverse (124730112), we get a palindrome (335767533).

The spelling of 211037421 in words is "two hundred eleven million, thirty-seven thousand, four hundred twenty-one".