21470017122644 has 6 divisors (see below), whose sum is σ = 37572529964634. Its totient is φ = 10735008561320.

The previous prime is 21470017122637. The next prime is 21470017122649. The reversal of 21470017122644 is 44622171007412.

It can be written as a sum of positive squares in only one way, i.e., 21327420258244 + 142596864400 = 4618162^2 + 377620^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470017122649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2683752140327 + ... + 2683752140334.

It is an arithmetic number, because the mean of its divisors is an integer number (6262088327439).

Almost surely, 2^{21470017122644} is an apocalyptic number.

It is an amenable number.

21470017122644 is a deficient number, since it is larger than the sum of its proper divisors (16102512841990).

21470017122644 is a wasteful number, since it uses less digits than its factorization.

21470017122644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5367504280665 (or 5367504280663 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 41.

The spelling of 21470017122644 in words is "twenty-one trillion, four hundred seventy billion, seventeen million, one hundred twenty-two thousand, six hundred forty-four".