21449035776 has 260 divisors, whose sum is σ = 66809989792. Its totient is φ = 6119866368.

The previous prime is 21449035763. The next prime is 21449035787. The reversal of 21449035776 is 67753094412.

It is a super-2 number, since 2×21449035776² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29503125 + ... + 29503851.

Almost surely, 2^21449035776 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 21449035776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33404994896).

21449035776 is an abundant number, since it is smaller than the sum of its proper divisors (45360954016).

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

21449035776 is an frugal number, since it uses more digits than its factorization.

21449035776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782 (or 739 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 21449035776 in words is "twenty-one billion, four hundred forty-nine million, thirty-five thousand, seven hundred seventy-six".