21140051426 has 8 divisors (see below), whose sum is σ = 34149313884. Its totient is φ = 9756946800.

The previous prime is 21140051423. The next prime is 21140051483. The reversal of 21140051426 is 62415004112.

It can be written as a sum of positive squares in 2 ways, for example, as 16371458401 + 4768593025 = 127951^2 + 69055^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 813078901 = 21140051426 / (2 + 1 + 1 + 4 + 0 + 0 + 5 + 1 + 4 + 2 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 21140051395 and 21140051404.

It is not an unprimeable number, because it can be changed into a prime (21140051423) 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, 406539425 + ... + 406539476.

Almost surely, 2^21140051426 is an apocalyptic number.

21140051426 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21140051426 is a deficient number, since it is larger than the sum of its proper divisors (13009262458).

21140051426 is a wasteful number, since it uses less digits than its factorization.

21140051426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813078916.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 21140051426 its reverse (62415004112), we get a palindrome (83555055538).

The spelling of 21140051426 in words is "twenty-one billion, one hundred forty million, fifty-one thousand, four hundred twenty-six".