10021421042 has 4 divisors (see below), whose sum is σ = 15032131566. Its totient is φ = 5010710520.

The previous prime is 10021421041. The next prime is 10021421071. The reversal of 10021421042 is 24012412001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24012412001 = 47 ⋅510902383.

It can be written as a sum of positive squares in only one way, i.e., 9123879361 + 897541681 = 95519^2 + 29959^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 10021421042.

It is not an unprimeable number, because it can be changed into a prime (10021421041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2505355259 + ... + 2505355262.

Almost surely, 2^10021421042 is an apocalyptic number.

10021421042 is a deficient number, since it is larger than the sum of its proper divisors (5010710524).

10021421042 is an equidigital number, since it uses as much as digits as its factorization.

10021421042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5010710523.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 10021421042 its reverse (24012412001), we get a palindrome (34033833043).

The spelling of 10021421042 in words is "ten billion, twenty-one million, four hundred twenty-one thousand, forty-two".