21263235650 has 12 divisors (see below), whose sum is σ = 39549618402. Its totient is φ = 8505294240.

The previous prime is 21263235649. The next prime is 21263235671. The reversal of 21263235650 is 5653236212.

It can be written as a sum of positive squares in 3 ways, for example, as 9368497681 + 11894737969 = 96791^2 + 109063^2 .

It is a super-3 number, since 3×21263235650³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21263235650.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 212632307 + ... + 212632406.

Almost surely, 2^21263235650 is an apocalyptic number.

21263235650 is a deficient number, since it is larger than the sum of its proper divisors (18286382752).

21263235650 is a wasteful number, since it uses less digits than its factorization.

21263235650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425264725 (or 425264720 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 35.

The spelling of 21263235650 in words is "twenty-one billion, two hundred sixty-three million, two hundred thirty-five thousand, six hundred fifty".