21071170717212 has 72 divisors (see below), whose sum is σ = 62392557467520. Its totient is φ = 5473031353440.

The previous prime is 21071170717193. The next prime is 21071170717241. The reversal of 21071170717212 is 21271707117012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1628871912 + ... + 1628884847.

It is an arithmetic number, because the mean of its divisors is an integer number (866563298160).

Almost surely, 2^{21071170717212} is an apocalyptic number.

21071170717212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21071170717212 is an abundant number, since it is smaller than the sum of its proper divisors (41321386750308).

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

21071170717212 is a wasteful number, since it uses less digits than its factorization.

21071170717212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3257756791 (or 3257756782 counting only the distinct ones).

The product of its (nonzero) digits is 19208, while the sum is 39.

The spelling of 21071170717212 in words is "twenty-one trillion, seventy-one billion, one hundred seventy million, seven hundred seventeen thousand, two hundred twelve".