21050251042 has 8 divisors (see below), whose sum is σ = 31701175632. Its totient is φ = 10483192500.

The previous prime is 21050250983. The next prime is 21050251049. The reversal of 21050251042 is 24015205012.

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

It is a super-2 number, since 2×21050251042² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21050251049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20965884 + ... + 20966887.

It is an arithmetic number, because the mean of its divisors is an integer number (3962646954).

Almost surely, 2^21050251042 is an apocalyptic number.

21050251042 is a deficient number, since it is larger than the sum of its proper divisors (10650924590).

21050251042 is a wasteful number, since it uses less digits than its factorization.

21050251042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41933024.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 21050251042 its reverse (24015205012), we get a palindrome (45065456054).

The spelling of 21050251042 in words is "twenty-one billion, fifty million, two hundred fifty-one thousand, forty-two".