21401423140 has 48 divisors (see below), whose sum is σ = 45736718832. Its totient is φ = 8410300416.

The previous prime is 21401423123. The next prime is 21401423143. The reversal of 21401423140 is 4132410412.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 17040384 + 21384382756 = 4128^2 + 146234^2 .

It is not an unprimeable number, because it can be changed into a prime (21401423143) 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, 346702 + ... + 403738.

It is an arithmetic number, because the mean of its divisors is an integer number (952848309).

Almost surely, 2^21401423140 is an apocalyptic number.

21401423140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21401423140 is an abundant number, since it is smaller than the sum of its proper divisors (24335295692).

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

21401423140 is a wasteful number, since it uses less digits than its factorization.

21401423140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57376 (or 57374 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21401423140 its reverse (4132410412), we get a palindrome (25533833552).

The spelling of 21401423140 in words is "twenty-one billion, four hundred one million, four hundred twenty-three thousand, one hundred forty".