201121642 has 8 divisors (see below), whose sum is σ = 302099616. Its totient is φ = 100421772.

The previous prime is 201121579. The next prime is 201121651. The reversal of 201121642 is 246121102.

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

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, 67708 + ... + 70615.

It is an arithmetic number, because the mean of its divisors is an integer number (37762452).

Almost surely, 2^201121642 is an apocalyptic number.

201121642 is a deficient number, since it is larger than the sum of its proper divisors (100977974).

201121642 is a wasteful number, since it uses less digits than its factorization.

201121642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139052.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 201121642 is about 14181.7362124671. The cubic root of 201121642 is about 585.8947439929.

Adding to 201121642 its reverse (246121102), we get a palindrome (447242744).

It can be divided in two parts, 2011 and 21642, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 201121642 in words is "two hundred one million, one hundred twenty-one thousand, six hundred forty-two".