21104137061 has 8 divisors (see below), whose sum is σ = 24120397824. Its totient is φ = 18088222320.

The previous prime is 21104137051. The next prime is 21104137063. The reversal of 21104137061 is 16073140112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21104137061 - 2²⁶ = 21037028197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21104137061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104137063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60956 + ... + 214298.

It is an arithmetic number, because the mean of its divisors is an integer number (3015049728).

Almost surely, 2^21104137061 is an apocalyptic number.

It is an amenable number.

21104137061 is a deficient number, since it is larger than the sum of its proper divisors (3016260763).

21104137061 is a wasteful number, since it uses less digits than its factorization.

21104137061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173011.

The product of its (nonzero) digits is 1008, while the sum is 26.

Adding to 21104137061 its reverse (16073140112), we get a palindrome (37177277173).

The spelling of 21104137061 in words is "twenty-one billion, one hundred four million, one hundred thirty-seven thousand, sixty-one".