21650401207 has 4 divisors (see below), whose sum is σ = 21780044496. Its totient is φ = 21520757920.

The previous prime is 21650401163. The next prime is 21650401237. The reversal of 21650401207 is 70210405612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21650401207 - 2¹¹ = 21650399159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21650401237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64821394 + ... + 64821727.

It is an arithmetic number, because the mean of its divisors is an integer number (5445011124).

Almost surely, 2^21650401207 is an apocalyptic number.

21650401207 is a deficient number, since it is larger than the sum of its proper divisors (129643289).

21650401207 is a wasteful number, since it uses less digits than its factorization.

21650401207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129643288.

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 21650401207 its reverse (70210405612), we get a palindrome (91860806819).

The spelling of 21650401207 in words is "twenty-one billion, six hundred fifty million, four hundred one thousand, two hundred seven".