221362421 has 8 divisors (see below), whose sum is σ = 254186304. Its totient is φ = 188838720.

The previous prime is 221362363. The next prime is 221362469. The reversal of 221362421 is 124263122.

It is a happy number.

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

It is not a de Polignac number, because 221362421 - 2⁶ = 221362357 is a prime.

It is a super-3 number, since 3×221362421³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221362021) 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, 73460 + ... + 76413.

It is an arithmetic number, because the mean of its divisors is an integer number (31773288).

Almost surely, 2^221362421 is an apocalyptic number.

It is an amenable number.

221362421 is a deficient number, since it is larger than the sum of its proper divisors (32823883).

221362421 is a wasteful number, since it uses less digits than its factorization.

221362421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150091.

The product of its digits is 1152, while the sum is 23.

The square root of 221362421 is about 14878.2532912973. The cubic root of 221362421 is about 604.9246733620.

The spelling of 221362421 in words is "two hundred twenty-one million, three hundred sixty-two thousand, four hundred twenty-one".