21001423104 has 54 divisors (see below), whose sum is σ = 60552286886. Its totient is φ = 7000473600.

The previous prime is 21001423097. The next prime is 21001423109. The reversal of 21001423104 is 40132410012.

21001423104 is a `hidden beast` number, since 210 + 0 + 142 + 310 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16796160000 + 4205263104 = 129600^2 + 64848^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21001423109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4555297 + ... + 4559904.

Almost surely, 2^21001423104 is an apocalyptic number.

21001423104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21001423104 is an abundant number, since it is smaller than the sum of its proper divisors (39550863782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001423104 is an equidigital number, since it uses as much as digits as its factorization.

21001423104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9115223 (or 9115206 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21001423104 its reverse (40132410012), we get a palindrome (61133833116).

The spelling of 21001423104 in words is "twenty-one billion, one million, four hundred twenty-three thousand, one hundred four".