21420224020140 has 96 divisors (see below), whose sum is σ = 65488369314816. Its totient is φ = 5188073533440.

The previous prime is 21420224020109. The next prime is 21420224020193. The reversal of 21420224020140 is 4102042202412.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21420224020140.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13984117 + ... + 15440076.

It is an arithmetic number, because the mean of its divisors is an integer number (682170513696).

Almost surely, 2^{21420224020140} is an apocalyptic number.

21420224020140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21420224020140 is an abundant number, since it is smaller than the sum of its proper divisors (44068145294676).

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

21420224020140 is a wasteful number, since it uses less digits than its factorization.

21420224020140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29425319 (or 29425317 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21420224020140 its reverse (4102042202412), we get a palindrome (25522266222552).

The spelling of 21420224020140 in words is "twenty-one trillion, four hundred twenty billion, two hundred twenty-four million, twenty thousand, one hundred forty".