21288411270 has 192 divisors, whose sum is σ = 64520202240. Its totient is φ = 4769259264.

The previous prime is 21288411269. The next prime is 21288411299. The reversal of 21288411270 is 7211488212.

It is a happy number.

21288411270 is a `hidden beast` number, since 212 + 8 + 8 + 411 + 27 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17209092 + ... + 17210328.

It is an arithmetic number, because the mean of its divisors is an integer number (336042720).

Almost surely, 2^21288411270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21288411270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32260101120).

21288411270 is an abundant number, since it is smaller than the sum of its proper divisors (43231790970).

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

21288411270 is a wasteful number, since it uses less digits than its factorization.

21288411270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779 (or 1776 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

Adding to 21288411270 its reverse (7211488212), we get a palindrome (28499899482).

The spelling of 21288411270 in words is "twenty-one billion, two hundred eighty-eight million, four hundred eleven thousand, two hundred seventy".