21121140650635 has 4 divisors (see below), whose sum is σ = 25345368780768. Its totient is φ = 16896912520504.

The previous prime is 21121140650629. The next prime is 21121140650669. The reversal of 21121140650635 is 53605604112112.

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 21121140650635 - 2⁹ = 21121140650123 is a prime.

It is a super-2 number, since 2×21121140650635² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121140650594 and 21121140650603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2112114065059 + ... + 2112114065068.

It is an arithmetic number, because the mean of its divisors is an integer number (6336342195192).

Almost surely, 2^{21121140650635} is an apocalyptic number.

21121140650635 is a deficient number, since it is larger than the sum of its proper divisors (4224228130133).

21121140650635 is an equidigital number, since it uses as much as digits as its factorization.

21121140650635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4224228130132.

The product of its (nonzero) digits is 43200, while the sum is 37.

Adding to 21121140650635 its reverse (53605604112112), we get a palindrome (74726744762747).

The spelling of 21121140650635 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred forty million, six hundred fifty thousand, six hundred thirty-five".