21470023615540 has 96 divisors (see below), whose sum is σ = 48866061936384. Its totient is φ = 7892173793280.

The previous prime is 21470023615529. The next prime is 21470023615561. The reversal of 21470023615540 is 4551632007412.

It is a junction number, because it is equal to n+sod(n) for n = 21470023615493 and 21470023615502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42983025 + ... + 43479655.

It is an arithmetic number, because the mean of its divisors is an integer number (509021478504).

Almost surely, 2^{21470023615540} is an apocalyptic number.

21470023615540 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 21470023615540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24433030968192).

21470023615540 is an abundant number, since it is smaller than the sum of its proper divisors (27396038320844).

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

21470023615540 is a wasteful number, since it uses less digits than its factorization.

21470023615540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499657 (or 499655 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 21470023615540 in words is "twenty-one trillion, four hundred seventy billion, twenty-three million, six hundred fifteen thousand, five hundred forty".