21010142 has 8 divisors (see below), whose sum is σ = 31551336. Its totient is φ = 10493032.

The previous prime is 21010127. The next prime is 21010153. The reversal of 21010142 is 24101012.

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

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, 3653 + ... + 7440.

It is an arithmetic number, because the mean of its divisors is an integer number (3943917).

Almost surely, 2^21010142 is an apocalyptic number.

21010142 is a deficient number, since it is larger than the sum of its proper divisors (10541194).

21010142 is a wasteful number, since it uses less digits than its factorization.

21010142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12042.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21010142 is about 4583.6821443028. The cubic root of 21010142 is about 275.9368247900.

Adding to 21010142 its reverse (24101012), we get a palindrome (45111154).

The spelling of 21010142 in words is "twenty-one million, ten thousand, one hundred forty-two".