21470161440 has 1152 divisors, whose sum is σ = 91738386432. Its totient is φ = 4172636160.

The previous prime is 21470161429. The next prime is 21470161499. The reversal of 21470161440 is 4416107412.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21470161398 and 21470161407.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 302396605 + ... + 302396675.

It is an arithmetic number, because the mean of its divisors is an integer number (79634016).

Almost surely, 2^21470161440 is an apocalyptic number.

21470161440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21470161440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45869193216).

21470161440 is an abundant number, since it is smaller than the sum of its proper divisors (70268224992).

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

21470161440 is a wasteful number, since it uses less digits than its factorization.

21470161440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

Adding to 21470161440 its reverse (4416107412), we get a palindrome (25886268852).

The spelling of 21470161440 in words is "twenty-one billion, four hundred seventy million, one hundred sixty-one thousand, four hundred forty".