21604073172270 has 16 divisors (see below), whose sum is σ = 51849775613520. Its totient is φ = 5761086179264.

The previous prime is 21604073172259. The next prime is 21604073172281. The reversal of 21604073172270 is 7227137040612.

It is an interprime number because it is at equal distance from previous prime (21604073172259) and next prime (21604073172281).

It is a Curzon number.

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, 360067886175 + ... + 360067886234.

It is an arithmetic number, because the mean of its divisors is an integer number (3240610975845).

Almost surely, 2^{21604073172270} is an apocalyptic number.

21604073172270 is an abundant number, since it is smaller than the sum of its proper divisors (30245702441250).

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

21604073172270 is a wasteful number, since it uses less digits than its factorization.

21604073172270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720135772419.

The product of its (nonzero) digits is 197568, while the sum is 42.

The spelling of 21604073172270 in words is "twenty-one trillion, six hundred four billion, seventy-three million, one hundred seventy-two thousand, two hundred seventy".