21010431242 has 8 divisors (see below), whose sum is σ = 31986029856. Its totient is φ = 10348421292.

The previous prime is 21010431227. The next prime is 21010431251. The reversal of 21010431242 is 24213401012.

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, 78396998 + ... + 78397265.

It is an arithmetic number, because the mean of its divisors is an integer number (3998253732).

Almost surely, 2^21010431242 is an apocalyptic number.

21010431242 is a deficient number, since it is larger than the sum of its proper divisors (10975598614).

21010431242 is a wasteful number, since it uses less digits than its factorization.

21010431242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156794332.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21010431242 its reverse (24213401012), we get a palindrome (45223832254).

The spelling of 21010431242 in words is "twenty-one billion, ten million, four hundred thirty-one thousand, two hundred forty-two".