21210110004 has 48 divisors (see below), whose sum is σ = 49634323200. Its totient is φ = 7049488896.

The previous prime is 21210110003. The next prime is 21210110011. The reversal of 21210110004 is 40001101212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210110003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10152192 + ... + 10154280.

It is an arithmetic number, because the mean of its divisors is an integer number (1034048400).

Almost surely, 2^21210110004 is an apocalyptic number.

It is an amenable number.

21210110004 is an abundant number, since it is smaller than the sum of its proper divisors (28424213196).

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

21210110004 is a wasteful number, since it uses less digits than its factorization.

21210110004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4152 (or 4150 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21210110004 its reverse (40001101212), we get a palindrome (61211211216).

The spelling of 21210110004 in words is "twenty-one billion, two hundred ten million, one hundred ten thousand, four".