21420142414420 has 48 divisors (see below), whose sum is σ = 45145345241808. Its totient is φ = 8537004564480.

The previous prime is 21420142414417. The next prime is 21420142414427. The reversal of 21420142414420 is 2441424102412.

It can be written as a sum of positive squares in 8 ways, for example, as 1102369803844 + 20317772610576 = 1049938^2 + 4507524^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420142414427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91337152 + ... + 91571368.

It is an arithmetic number, because the mean of its divisors is an integer number (940528025871).

Almost surely, 2^{21420142414420} is an apocalyptic number.

21420142414420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21420142414420 is an abundant number, since it is smaller than the sum of its proper divisors (23725202827388).

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

21420142414420 is a wasteful number, since it uses less digits than its factorization.

21420142414420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250780 (or 250778 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 31.

Adding to 21420142414420 its reverse (2441424102412), we get a palindrome (23861566516832).

The spelling of 21420142414420 in words is "twenty-one trillion, four hundred twenty billion, one hundred forty-two million, four hundred fourteen thousand, four hundred twenty".