21288470620 has 12 divisors (see below), whose sum is σ = 44705788344. Its totient is φ = 8515388240.

The previous prime is 21288470603. The next prime is 21288470641. The reversal of 21288470620 is 2607488212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532211746 + ... + 532211785.

It is an arithmetic number, because the mean of its divisors is an integer number (3725482362).

Almost surely, 2^21288470620 is an apocalyptic number.

21288470620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21288470620 is an abundant number, since it is smaller than the sum of its proper divisors (23417317724).

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

21288470620 is a wasteful number, since it uses less digits than its factorization.

21288470620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064423540 (or 1064423538 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

It can be divided in two parts, 2128 and 8470620, that added together give a palindrome (8472748).

The spelling of 21288470620 in words is "twenty-one billion, two hundred eighty-eight million, four hundred seventy thousand, six hundred twenty".