55221342 has 32 divisors (see below), whose sum is σ = 123427584. Its totient is φ = 16324800.

The previous prime is 55221329. The next prime is 55221343. The reversal of 55221342 is 24312255.

It is a super-2 number, since 2×55221342² = 6098793224561928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55221343) 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, 7498 + ... + 12909.

It is an arithmetic number, because the mean of its divisors is an integer number (3857112).

Almost surely, 2^55221342 is an apocalyptic number.

55221342 is an abundant number, since it is smaller than the sum of its proper divisors (68206242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55221342 is a wasteful number, since it uses less digits than its factorization.

55221342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20464.

The product of its digits is 2400, while the sum is 24.

The square root of 55221342 is about 7431.1063779225. The cubic root of 55221342 is about 380.8047166444.

Adding to 55221342 its reverse (24312255), we get a palindrome (79533597).

It can be divided in two parts, 552213 and 42, that added together give a palindrome (552255).

The spelling of 55221342 in words is "fifty-five million, two hundred twenty-one thousand, three hundred forty-two".