21850540826 has 8 divisors (see below), whose sum is σ = 32787829620. Its totient is φ = 10921264288.

The previous prime is 21850540813. The next prime is 21850540843. The reversal of 21850540826 is 62804505812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13920460225 + 7930080601 = 117985^2 + 89051^2 .

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

It is a super-2 number, since 2×21850540826² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1996241 + ... + 2007156.

Almost surely, 2^21850540826 is an apocalyptic number.

21850540826 is a deficient number, since it is larger than the sum of its proper divisors (10937288794).

21850540826 is a wasteful number, since it uses less digits than its factorization.

21850540826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006128.

The product of its (nonzero) digits is 153600, while the sum is 41.

The spelling of 21850540826 in words is "twenty-one billion, eight hundred fifty million, five hundred forty thousand, eight hundred twenty-six".