21401341240 has 16 divisors (see below), whose sum is σ = 48153017880. Its totient is φ = 8560536480.

The previous prime is 21401341219. The next prime is 21401341333. The reversal of 21401341240 is 4214310412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267516726 + ... + 267516805.

Almost surely, 2^21401341240 is an apocalyptic number.

21401341240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21401341240 is an abundant number, since it is smaller than the sum of its proper divisors (26751676640).

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

21401341240 is a wasteful number, since it uses less digits than its factorization.

21401341240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535033542 (or 535033538 counting only the distinct ones).

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

Adding to 21401341240 its reverse (4214310412), we get a palindrome (25615651652).

The spelling of 21401341240 in words is "twenty-one billion, four hundred one million, three hundred forty-one thousand, two hundred forty".