201021742 has 8 divisors (see below), whose sum is σ = 301925016. Its totient is φ = 100380072.

The previous prime is 201021721. The next prime is 201021749. The reversal of 201021742 is 247120102.

It is a happy number.

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 (201021749) 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, 63468 + ... + 66559.

It is an arithmetic number, because the mean of its divisors is an integer number (37740627).

Almost surely, 2^201021742 is an apocalyptic number.

201021742 is a deficient number, since it is larger than the sum of its proper divisors (100903274).

201021742 is a wasteful number, since it uses less digits than its factorization.

201021742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130802.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 201021742 is about 14178.2136392424. The cubic root of 201021742 is about 585.7977204900.

Adding to 201021742 its reverse (247120102), we get a palindrome (448141844).

The spelling of 201021742 in words is "two hundred one million, twenty-one thousand, seven hundred forty-two".