21230421140 has 24 divisors (see below), whose sum is σ = 44629280640. Its totient is φ = 8483521568.

The previous prime is 21230421133. The next prime is 21230421161. The reversal of 21230421140 is 4112403212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520280 + ... + 559599.

It is an arithmetic number, because the mean of its divisors is an integer number (1859553360).

Almost surely, 2^21230421140 is an apocalyptic number.

21230421140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230421140 is an abundant number, since it is smaller than the sum of its proper divisors (23398859500).

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

21230421140 is a wasteful number, since it uses less digits than its factorization.

21230421140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080871 (or 1080869 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21230421140 its reverse (4112403212), we get a palindrome (25342824352).

The spelling of 21230421140 in words is "twenty-one billion, two hundred thirty million, four hundred twenty-one thousand, one hundred forty".