10001221042 has 4 divisors (see below), whose sum is σ = 15001831566. Its totient is φ = 5000610520.

The previous prime is 10001221019. The next prime is 10001221081. The reversal of 10001221042 is 24012210001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9927930321 + 73290721 = 99639^2 + 8561^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2500305259 + ... + 2500305262.

Almost surely, 2^10001221042 is an apocalyptic number.

10001221042 is a deficient number, since it is larger than the sum of its proper divisors (5000610524).

10001221042 is an equidigital number, since it uses as much as digits as its factorization.

10001221042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000610523.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 10001221042 its reverse (24012210001), we get a palindrome (34013431043).

The spelling of 10001221042 in words is "ten billion, one million, two hundred twenty-one thousand, forty-two".