21000101103 has 24 divisors (see below), whose sum is σ = 30861267840. Its totient is φ = 13756683600.

The previous prime is 21000101069. The next prime is 21000101107. The reversal of 21000101103 is 30110100012.

It is not a de Polignac number, because 21000101103 - 2⁹ = 21000100591 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000101107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1406628 + ... + 1421478.

It is an arithmetic number, because the mean of its divisors is an integer number (1285886160).

Almost surely, 2^21000101103 is an apocalyptic number.

21000101103 is a deficient number, since it is larger than the sum of its proper divisors (9861166737).

21000101103 is a wasteful number, since it uses less digits than its factorization.

21000101103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17579 (or 17576 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 21000101103 its reverse (30110100012), we get a palindrome (51110201115).

The spelling of 21000101103 in words is "twenty-one billion, one hundred one thousand, one hundred three".