21142260026 has 4 divisors (see below), whose sum is σ = 31713390042. Its totient is φ = 10571130012.

The previous prime is 21142260023. The next prime is 21142260037. The reversal of 21142260026 is 62006224112.

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., 19168679401 + 1973580625 = 138451^2 + 44425^2 .

It is a super-4 number, since 4×21142260026⁴ (a number of 42 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21142259977 and 21142260004.

It is not an unprimeable number, because it can be changed into a prime (21142260023) 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 as a sum of consecutive naturals, namely, 5285565005 + ... + 5285565008.

Almost surely, 2^21142260026 is an apocalyptic number.

21142260026 is a deficient number, since it is larger than the sum of its proper divisors (10571130016).

21142260026 is a wasteful number, since it uses less digits than its factorization.

21142260026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10571130015.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21142260026 its reverse (62006224112), we get a palindrome (83148484138).

The spelling of 21142260026 in words is "twenty-one billion, one hundred forty-two million, two hundred sixty thousand, twenty-six".