21351060653648 has 80 divisors (see below), whose sum is σ = 45486666571776. Its totient is φ = 9627986229120.

The previous prime is 21351060653647. The next prime is 21351060653677. The reversal of 21351060653648 is 84635606015312.

It is a happy number.

It is a super-2 number, since 2×21351060653648² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21351060653596 and 21351060653605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21351060653647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 658093715 + ... + 658126157.

Almost surely, 2^{21351060653648} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21351060653648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22743333285888).

21351060653648 is an abundant number, since it is smaller than the sum of its proper divisors (24135605918128).

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

21351060653648 is a wasteful number, since it uses less digits than its factorization.

21351060653648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62032 (or 62026 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 50.

The spelling of 21351060653648 in words is "twenty-one trillion, three hundred fifty-one billion, sixty million, six hundred fifty-three thousand, six hundred forty-eight".