21571222701 has 48 divisors (see below), whose sum is σ = 34955363840. Its totient is φ = 11588832000.

The previous prime is 21571222697. The next prime is 21571222793. The reversal of 21571222701 is 10722217512.

It is not a de Polignac number, because 21571222701 - 2² = 21571222697 is a prime.

It is a super-2 number, since 2×21571222701² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21571222301) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9581826 + ... + 9584076.

Almost surely, 2^21571222701 is an apocalyptic number.

21571222701 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21571222701 is a deficient number, since it is larger than the sum of its proper divisors (13384141139).

21571222701 is a wasteful number, since it uses less digits than its factorization.

21571222701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3874 (or 3857 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 30.

The spelling of 21571222701 in words is "twenty-one billion, five hundred seventy-one million, two hundred twenty-two thousand, seven hundred one".