21002003442420 has 384 divisors, whose sum is σ = 81089732247552. Its totient is φ = 3919481395200.

The previous prime is 21002003442377. The next prime is 21002003442467. The reversal of 21002003442420 is 2424430020012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2503236 + ... + 6947675.

It is an arithmetic number, because the mean of its divisors is an integer number (211171177728).

Almost surely, 2^{21002003442420} is an apocalyptic number.

21002003442420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002003442420 is an abundant number, since it is smaller than the sum of its proper divisors (60087728805132).

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

21002003442420 is a wasteful number, since it uses less digits than its factorization.

21002003442420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9450991 (or 9450989 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21002003442420 its reverse (2424430020012), we get a palindrome (23426433462432).

The spelling of 21002003442420 in words is "twenty-one trillion, two billion, three million, four hundred forty-two thousand, four hundred twenty".