221355542 has 8 divisors (see below), whose sum is σ = 346469616. Its totient is φ = 105865672.

The previous prime is 221355509. The next prime is 221355553. The reversal of 221355542 is 245553122.

221355542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×221355542² = 97996551948227528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2405993 + ... + 2406084.

It is an arithmetic number, because the mean of its divisors is an integer number (43308702).

Almost surely, 2^221355542 is an apocalyptic number.

221355542 is a deficient number, since it is larger than the sum of its proper divisors (125114074).

221355542 is a wasteful number, since it uses less digits than its factorization.

221355542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4812102.

The product of its digits is 12000, while the sum is 29.

The square root of 221355542 is about 14878.0221131708. The cubic root of 221355542 is about 604.9184071374.

The spelling of 221355542 in words is "two hundred twenty-one million, three hundred fifty-five thousand, five hundred forty-two".