21400650635 has 16 divisors (see below), whose sum is σ = 31607115456. Its totient is φ = 13545906048.

The previous prime is 21400650629. The next prime is 21400650647. The reversal of 21400650635 is 53605600412.

It is a cyclic number.

It is not a de Polignac number, because 21400650635 - 2⁶ = 21400650571 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 23516744 + ... + 23517653.

It is an arithmetic number, because the mean of its divisors is an integer number (1975444716).

Almost surely, 2^21400650635 is an apocalyptic number.

21400650635 is a deficient number, since it is larger than the sum of its proper divisors (10206464821).

21400650635 is a wasteful number, since it uses less digits than its factorization.

21400650635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47034422.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 21400650635 in words is "twenty-one billion, four hundred million, six hundred fifty thousand, six hundred thirty-five".