21420213488 has 10 divisors (see below), whose sum is σ = 41501663664. Its totient is φ = 10710106736.

The previous prime is 21420213439. The next prime is 21420213491. The reversal of 21420213488 is 88431202412.

It is a super-2 number, since 2×21420213488² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669381656 + ... + 669381687.

Almost surely, 2^21420213488 is an apocalyptic number.

It is an amenable number.

21420213488 is a deficient number, since it is larger than the sum of its proper divisors (20081450176).

21420213488 is a wasteful number, since it uses less digits than its factorization.

21420213488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338763351 (or 1338763345 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

The spelling of 21420213488 in words is "twenty-one billion, four hundred twenty million, two hundred thirteen thousand, four hundred eighty-eight".