21642221310 has 32 divisors (see below), whose sum is σ = 52164272160. Its totient is φ = 5746487808.

The previous prime is 21642221291. The next prime is 21642221323. The reversal of 21642221310 is 1312224612.

It is a super-2 number, since 2×21642221310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1541095 + ... + 1555074.

It is an arithmetic number, because the mean of its divisors is an integer number (1630133505).

Almost surely, 2^21642221310 is an apocalyptic number.

21642221310 is an abundant number, since it is smaller than the sum of its proper divisors (30522050850).

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

21642221310 is a wasteful number, since it uses less digits than its factorization.

21642221310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096412.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21642221310 its reverse (1312224612), we get a palindrome (22954445922).

It can be divided in two parts, 216422 and 21310, that added together give a palindrome (237732).

The spelling of 21642221310 in words is "twenty-one billion, six hundred forty-two million, two hundred twenty-one thousand, three hundred ten".