211420421 has 8 divisors (see below), whose sum is σ = 213386400. Its totient is φ = 209462032.

The previous prime is 211420409. The next prime is 211420453. The reversal of 211420421 is 124024112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211420421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211420421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211420471) 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, 64406 + ... + 67608.

It is an arithmetic number, because the mean of its divisors is an integer number (26673300).

Almost surely, 2^211420421 is an apocalyptic number.

It is an amenable number.

211420421 is a deficient number, since it is larger than the sum of its proper divisors (1965979).

211420421 is a wasteful number, since it uses less digits than its factorization.

211420421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3795.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 211420421 is about 14540.3033324618. The cubic root of 211420421 is about 595.7293233981.

Adding to 211420421 its reverse (124024112), we get a palindrome (335444533).

The spelling of 211420421 in words is "two hundred eleven million, four hundred twenty thousand, four hundred twenty-one".