21012041003420 has 24 divisors (see below), whose sum is σ = 44530105250400. Its totient is φ = 8327707993152.

The previous prime is 21012041003407. The next prime is 21012041003501. The reversal of 21012041003420 is 2430014021012.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21012041003392 and 21012041003401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4819273280 + ... + 4819277639.

It is an arithmetic number, because the mean of its divisors is an integer number (1855421052100).

Almost surely, 2^{21012041003420} is an apocalyptic number.

21012041003420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012041003420 is an abundant number, since it is smaller than the sum of its proper divisors (23518064246980).

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

21012041003420 is a wasteful number, since it uses less digits than its factorization.

21012041003420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9638551037 (or 9638551035 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21012041003420 its reverse (2430014021012), we get a palindrome (23442055024432).

The spelling of 21012041003420 in words is "twenty-one trillion, twelve billion, forty-one million, three thousand, four hundred twenty".