21142025254540 has 48 divisors (see below), whose sum is σ = 44816550149952. Its totient is φ = 8377480130816.

The previous prime is 21142025254501. The next prime is 21142025254543. The reversal of 21142025254540 is 4545252024112.

It is a super-2 number, since 2×21142025254540² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21142025254540.

It is not an unprimeable number, because it can be changed into a prime (21142025254543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9823339 + ... + 11780578.

It is an arithmetic number, because the mean of its divisors is an integer number (933678128124).

Almost surely, 2^{21142025254540} is an apocalyptic number.

21142025254540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21142025254540 is an abundant number, since it is smaller than the sum of its proper divisors (23674524895412).

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

21142025254540 is a wasteful number, since it uses less digits than its factorization.

21142025254540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21604386 (or 21604384 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 37.

Adding to 21142025254540 its reverse (4545252024112), we get a palindrome (25687277278652).

The spelling of 21142025254540 in words is "twenty-one trillion, one hundred forty-two billion, twenty-five million, two hundred fifty-four thousand, five hundred forty".