21402141504 has 28 divisors (see below), whose sum is σ = 56626499904. Its totient is φ = 7134047104.

The previous prime is 21402141463. The next prime is 21402141559. The reversal of 21402141504 is 40514120412.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55734552 + ... + 55734935.

Almost surely, 2^21402141504 is an apocalyptic number.

21402141504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21402141504 is an abundant number, since it is smaller than the sum of its proper divisors (35224358400).

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

21402141504 is a wasteful number, since it uses less digits than its factorization.

21402141504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111469502 (or 111469492 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 21402141504 its reverse (40514120412), we get a palindrome (61916261916).

The spelling of 21402141504 in words is "twenty-one billion, four hundred two million, one hundred forty-one thousand, five hundred four".