21342000020 has 48 divisors (see below), whose sum is σ = 49148660736. Its totient is φ = 7720080000.

The previous prime is 21341999981. The next prime is 21342000077. The reversal of 21342000020 is 2000024312.

It is a junction number, because it is equal to n+sod(n) for n = 21341999959 and 21342000004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211931 + ... + 295970.

It is an arithmetic number, because the mean of its divisors is an integer number (1023930432).

Almost surely, 2^21342000020 is an apocalyptic number.

21342000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21342000020 is an abundant number, since it is smaller than the sum of its proper divisors (27806660716).

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

21342000020 is a wasteful number, since it uses less digits than its factorization.

21342000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508112 (or 508110 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 21342000020 its reverse (2000024312), we get a palindrome (23342024332).

The spelling of 21342000020 in words is "twenty-one billion, three hundred forty-two million, twenty", and thus it is an aban number.