21470732116240 has 80 divisors (see below), whose sum is σ = 54458810055936. Its totient is φ = 7807363200000.

The previous prime is 21470732116237. The next prime is 21470732116271. The reversal of 21470732116240 is 4261123707412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 21470732116193 and 21470732116202.

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, 42650644 + ... + 43151116.

Almost surely, 2^{21470732116240} is an apocalyptic number.

21470732116240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21470732116240 is an abundant number, since it is smaller than the sum of its proper divisors (32988077939696).

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

21470732116240 is a wasteful number, since it uses less digits than its factorization.

21470732116240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549248 (or 549242 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 21470732116240 in words is "twenty-one trillion, four hundred seventy billion, seven hundred thirty-two million, one hundred sixteen thousand, two hundred forty".