52221421 has 4 divisors (see below), whose sum is σ = 59681632. Its totient is φ = 44761212.

The previous prime is 52221409. The next prime is 52221461. The reversal of 52221421 is 12412225.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 52221421 - 2¹¹ = 52219373 is a prime.

It is a super-2 number, since 2×52221421² = 5454153622518482, which contains 22 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 (52221461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3730095 + ... + 3730108.

It is an arithmetic number, because the mean of its divisors is an integer number (14920408).

Almost surely, 2^52221421 is an apocalyptic number.

It is an amenable number.

52221421 is a deficient number, since it is larger than the sum of its proper divisors (7460211).

52221421 is an equidigital number, since it uses as much as digits as its factorization.

52221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7460210.

The product of its digits is 320, while the sum is 19.

The square root of 52221421 is about 7226.4390262425. The cubic root of 52221421 is about 373.7801452179.

Adding to 52221421 its reverse (12412225), we get a palindrome (64633646).

The spelling of 52221421 in words is "fifty-two million, two hundred twenty-one thousand, four hundred twenty-one".