21540041402 has 8 divisors (see below), whose sum is σ = 35247340512. Its totient is φ = 9790927900.

The previous prime is 21540041387. The next prime is 21540041423. The reversal of 21540041402 is 20414004512.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 489546374 + ... + 489546417.

It is an arithmetic number, because the mean of its divisors is an integer number (4405917564).

Almost surely, 2^21540041402 is an apocalyptic number.

21540041402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21540041402 is a deficient number, since it is larger than the sum of its proper divisors (13707299110).

21540041402 is a wasteful number, since it uses less digits than its factorization.

21540041402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979092804.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 21540041402 its reverse (20414004512), we get a palindrome (41954045914).

The spelling of 21540041402 in words is "twenty-one billion, five hundred forty million, forty-one thousand, four hundred two".