211112420421 has 16 divisors (see below), whose sum is σ = 324228153344. Its totient is φ = 119685780144.

The previous prime is 211112420419. The next prime is 211112420459. The reversal of 211112420421 is 124024211112.

It is not a de Polignac number, because 211112420421 - 2¹ = 211112420419 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (211112420461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39575965 + ... + 39581298.

It is an arithmetic number, because the mean of its divisors is an integer number (20264259584).

Almost surely, 2^211112420421 is an apocalyptic number.

211112420421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211112420421 is a deficient number, since it is larger than the sum of its proper divisors (113115732923).

211112420421 is a wasteful number, since it uses less digits than its factorization.

211112420421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79157400.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 211112420421 its reverse (124024211112), we get a palindrome (335136631533).

The spelling of 211112420421 in words is "two hundred eleven billion, one hundred twelve million, four hundred twenty thousand, four hundred twenty-one".