21655420603415 has 16 divisors (see below), whose sum is σ = 25998377703840. Its totient is φ = 17316422392320.

The previous prime is 21655420603403. The next prime is 21655420603423. The reversal of 21655420603415 is 51430602455612.

It is not a de Polignac number, because 21655420603415 - 2²² = 21655416409111 is a prime.

It is a congruent number.

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, 154900616 + ... + 155040354.

It is an arithmetic number, because the mean of its divisors is an integer number (1624898606490).

Almost surely, 2^{21655420603415} is an apocalyptic number.

21655420603415 is a deficient number, since it is larger than the sum of its proper divisors (4342957100425).

21655420603415 is a wasteful number, since it uses less digits than its factorization.

21655420603415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153682.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 21655420603415 in words is "twenty-one trillion, six hundred fifty-five billion, four hundred twenty million, six hundred three thousand, four hundred fifteen".