211302421 has 6 divisors (see below), whose sum is σ = 232258166. Its totient is φ = 192093000.

The previous prime is 211302407. The next prime is 211302431. The reversal of 211302421 is 124203112.

It can be written as a sum of positive squares in only one way, i.e., 160022500 + 51279921 = 12650^2 + 7161^2 .

It is not a de Polignac number, because 211302421 - 2¹⁹ = 210778133 is a prime.

It is a super-2 number, since 2×211302421² = 89297426240922482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211302395 and 211302404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211302431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 873030 + ... + 873271.

Almost surely, 2^211302421 is an apocalyptic number.

It is an amenable number.

211302421 is a deficient number, since it is larger than the sum of its proper divisors (20955745).

211302421 is a wasteful number, since it uses less digits than its factorization.

211302421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746323 (or 1746312 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 211302421 is about 14536.2450791117. The cubic root of 211302421 is about 595.6184713779.

Adding to 211302421 its reverse (124203112), we get a palindrome (335505533).

The spelling of 211302421 in words is "two hundred eleven million, three hundred two thousand, four hundred twenty-one".