21230131104 has 240 divisors, whose sum is σ = 76846670208. Its totient is φ = 5599093248.

The previous prime is 21230131093. The next prime is 21230131121. The reversal of 21230131104 is 40113103212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 190869 + ... + 280875.

Almost surely, 2^21230131104 is an apocalyptic number.

21230131104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21230131104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38423335104).

21230131104 is an abundant number, since it is smaller than the sum of its proper divisors (55616539104).

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

21230131104 is a wasteful number, since it uses less digits than its factorization.

21230131104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90049 (or 90032 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21230131104 its reverse (40113103212), we get a palindrome (61343234316).

The spelling of 21230131104 in words is "twenty-one billion, two hundred thirty million, one hundred thirty-one thousand, one hundred four".