21641051037 has 4 divisors (see below), whose sum is σ = 28854734720. Its totient is φ = 14427367356.

The previous prime is 21641050979. The next prime is 21641051039. The reversal of 21641051037 is 73015014612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21641051037 - 2¹⁶ = 21640985501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21641050995 and 21641051013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21641051039) 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, 3606841837 + ... + 3606841842.

It is an arithmetic number, because the mean of its divisors is an integer number (7213683680).

Almost surely, 2^21641051037 is an apocalyptic number.

It is an amenable number.

21641051037 is a deficient number, since it is larger than the sum of its proper divisors (7213683683).

21641051037 is an equidigital number, since it uses as much as digits as its factorization.

21641051037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7213683682.

The product of its (nonzero) digits is 5040, while the sum is 30.

Adding to 21641051037 its reverse (73015014612), we get a palindrome (94656065649).

The spelling of 21641051037 in words is "twenty-one billion, six hundred forty-one million, fifty-one thousand, thirty-seven".