201858421 has 8 divisors (see below), whose sum is σ = 207536544. Its totient is φ = 196192080.

The previous prime is 201858401. The next prime is 201858431. The reversal of 201858421 is 124858102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201858421 is a prime.

It is a super-2 number, since 2×201858421² = 81493644257226482, 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 (201858401) 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, 40686 + ... + 45376.

It is an arithmetic number, because the mean of its divisors is an integer number (25942068).

Almost surely, 2^201858421 is an apocalyptic number.

It is an amenable number.

201858421 is a deficient number, since it is larger than the sum of its proper divisors (5678123).

201858421 is a wasteful number, since it uses less digits than its factorization.

201858421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5891.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 201858421 is about 14207.6887986752. The cubic root of 201858421 is about 586.6093179924.

The spelling of 201858421 in words is "two hundred one million, eight hundred fifty-eight thousand, four hundred twenty-one".