21101404000021 has 8 divisors (see below), whose sum is σ = 22018904037504. Its totient is φ = 20183907936720.

The previous prime is 21101403999961. The next prime is 21101404000073. The reversal of 21101404000021 is 12000040410112.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-21101404000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101403999959 and 21101404000004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101404000421) 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, 16152231 + ... + 17409691.

It is an arithmetic number, because the mean of its divisors is an integer number (2752363004688).

Almost surely, 2^{21101404000021} is an apocalyptic number.

It is an amenable number.

21101404000021 is a deficient number, since it is larger than the sum of its proper divisors (917500037483).

21101404000021 is a wasteful number, since it uses less digits than its factorization.

21101404000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987091.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21101404000021 its reverse (12000040410112), we get a palindrome (33101444410133).

The spelling of 21101404000021 in words is "twenty-one trillion, one hundred one billion, four hundred four million, twenty-one", and thus it is an aban number.