21652405122644 has 24 divisors (see below), whose sum is σ = 38036407442880. Its totient is φ = 10784861489664.

The previous prime is 21652405122583. The next prime is 21652405122653. The reversal of 21652405122644 is 44622150425612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21652405122595 and 21652405122604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83967092 + ... + 84224564.

It is an arithmetic number, because the mean of its divisors is an integer number (1584850310120).

Almost surely, 2^{21652405122644} is an apocalyptic number.

It is an amenable number.

21652405122644 is a deficient number, since it is larger than the sum of its proper divisors (16384002320236).

21652405122644 is a wasteful number, since it uses less digits than its factorization.

21652405122644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337679 (or 337677 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 44.

The spelling of 21652405122644 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred five million, one hundred twenty-two thousand, six hundred forty-four".