21514221420 has 48 divisors (see below), whose sum is σ = 60772934880. Its totient is φ = 5686352896.

The previous prime is 21514221419. The next prime is 21514221427. The reversal of 21514221420 is 2412241512.

It is not an unprimeable number, because it can be changed into a prime (21514221427) by changing a digit.

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, 1579815 + ... + 1593374.

It is an arithmetic number, because the mean of its divisors is an integer number (1266102810).

Almost surely, 2^21514221420 is an apocalyptic number.

21514221420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21514221420 is an abundant number, since it is smaller than the sum of its proper divisors (39258713460).

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

21514221420 is a wasteful number, since it uses less digits than its factorization.

21514221420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173314 (or 3173312 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 21514221420 its reverse (2412241512), we get a palindrome (23926462932).

The spelling of 21514221420 in words is "twenty-one billion, five hundred fourteen million, two hundred twenty-one thousand, four hundred twenty".