21010525426 has 24 divisors (see below), whose sum is σ = 34959175020. Its totient is φ = 9462610080.

The previous prime is 21010525411. The next prime is 21010525429. The reversal of 21010525426 is 62452501012.

It can be written as a sum of positive squares in 2 ways, for example, as 20622396025 + 388129401 = 143605^2 + 19701^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21010525394 and 21010525403.

It is not an unprimeable number, because it can be changed into a prime (21010525429) 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 11 ways as a sum of consecutive naturals, for example, 371881 + ... + 424636.

Almost surely, 2^21010525426 is an apocalyptic number.

21010525426 is a deficient number, since it is larger than the sum of its proper divisors (13948649594).

21010525426 is a wasteful number, since it uses less digits than its factorization.

21010525426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796650 (or 796639 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 21010525426 in words is "twenty-one billion, ten million, five hundred twenty-five thousand, four hundred twenty-six".