21000533101 has 4 divisors (see below), whose sum is σ = 21356474400. Its totient is φ = 20644591804.

The previous prime is 21000533063. The next prime is 21000533119. The reversal of 21000533101 is 10133500012.

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 a cyclic number.

It is not a de Polignac number, because 21000533101 - 2⁹ = 21000532589 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 (21000539101) 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, 177970561 + ... + 177970678.

It is an arithmetic number, because the mean of its divisors is an integer number (5339118600).

Almost surely, 2^21000533101 is an apocalyptic number.

It is an amenable number.

21000533101 is a deficient number, since it is larger than the sum of its proper divisors (355941299).

21000533101 is an equidigital number, since it uses as much as digits as its factorization.

21000533101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355941298.

The product of its (nonzero) digits is 90, while the sum is 16.

The spelling of 21000533101 in words is "twenty-one billion, five hundred thirty-three thousand, one hundred one".