205421542 has 8 divisors (see below), whose sum is σ = 308213136. Its totient is φ = 102683832.

The previous prime is 205421527. The next prime is 205421543. The reversal of 205421542 is 245124502.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205421543) 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, 1978 + ... + 20365.

It is an arithmetic number, because the mean of its divisors is an integer number (38526642).

Almost surely, 2^205421542 is an apocalyptic number.

205421542 is a deficient number, since it is larger than the sum of its proper divisors (102791594).

205421542 is a wasteful number, since it uses less digits than its factorization.

205421542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26942.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 205421542 is about 14332.5343885860. The cubic root of 205421542 is about 590.0407345236.

The spelling of 205421542 in words is "two hundred five million, four hundred twenty-one thousand, five hundred forty-two".