221141421 has 28 divisors (see below), whose sum is σ = 332796640. Its totient is φ = 146878920.

The previous prime is 221141377. The next prime is 221141467. The reversal of 221141421 is 124141122.

It is not a de Polignac number, because 221141421 - 2¹⁵ = 221108653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221141394 and 221141403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221141471) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 319686 + ... + 320376.

Almost surely, 2^221141421 is an apocalyptic number.

It is an amenable number.

221141421 is a deficient number, since it is larger than the sum of its proper divisors (111655219).

221141421 is an frugal number, since it uses more digits than its factorization.

221141421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148 (or 1133 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 221141421 is about 14870.8244895836. The cubic root of 221141421 is about 604.7232949065.

Adding to 221141421 its reverse (124141122), we get a palindrome (345282543).

The spelling of 221141421 in words is "two hundred twenty-one million, one hundred forty-one thousand, four hundred twenty-one".