21655614015445 has 8 divisors (see below), whose sum is σ = 25987865784120. Its totient is φ = 17323738568640.

The previous prime is 21655614015401. The next prime is 21655614015461. The reversal of 21655614015445 is 54451041655612.

It can be written as a sum of positive squares in 4 ways, for example, as 235767542481 + 21419846472964 = 485559^2 + 4628158^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21655614015445 - 2²¹ = 21655611918293 is a prime.

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, 93953850 + ... + 94184059.

It is an arithmetic number, because the mean of its divisors is an integer number (3248483223015).

Almost surely, 2^{21655614015445} is an apocalyptic number.

It is an amenable number.

21655614015445 is a deficient number, since it is larger than the sum of its proper divisors (4332251768675).

21655614015445 is a wasteful number, since it uses less digits than its factorization.

21655614015445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188160935.

The product of its (nonzero) digits is 2880000, while the sum is 49.

The spelling of 21655614015445 in words is "twenty-one trillion, six hundred fifty-five billion, six hundred fourteen million, fifteen thousand, four hundred forty-five".