21214026550020 has 48 divisors (see below), whose sum is σ = 59445716520960. Its totient is φ = 5652650681856.

The previous prime is 21214026549979. The next prime is 21214026550033. The reversal of 21214026550020 is 2005562041212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 21214026550020.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138143397 + ... + 138296876.

It is an arithmetic number, because the mean of its divisors is an integer number (1238452427520).

Almost surely, 2^{21214026550020} is an apocalyptic number.

21214026550020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21214026550020 is an abundant number, since it is smaller than the sum of its proper divisors (38231689970940).

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

21214026550020 is a wasteful number, since it uses less digits than its factorization.

21214026550020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276441564 (or 276441562 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21214026550020 its reverse (2005562041212), we get a palindrome (23219588591232).

The spelling of 21214026550020 in words is "twenty-one trillion, two hundred fourteen billion, twenty-six million, five hundred fifty thousand, twenty".