21602212777340 has 24 divisors (see below), whose sum is σ = 48854235050880. Its totient is φ = 7976201640768.

The previous prime is 21602212777289. The next prime is 21602212777357. The reversal of 21602212777340 is 4377721220612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21602212777291 and 21602212777300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41542716620 + ... + 41542717139.

It is an arithmetic number, because the mean of its divisors is an integer number (2035593127120).

Almost surely, 2^{21602212777340} is an apocalyptic number.

21602212777340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21602212777340 is an abundant number, since it is smaller than the sum of its proper divisors (27252022273540).

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

21602212777340 is a wasteful number, since it uses less digits than its factorization.

21602212777340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83085433781 (or 83085433779 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 44.

Adding to 21602212777340 its reverse (4377721220612), we get a palindrome (25979933997952).

The spelling of 21602212777340 in words is "twenty-one trillion, six hundred two billion, two hundred twelve million, seven hundred seventy-seven thousand, three hundred forty".