21771161232 has 40 divisors (see below), whose sum is σ = 56252738880. Its totient is φ = 7255689600.

The previous prime is 21771161219. The next prime is 21771161233. The reversal of 21771161232 is 23216117712.

It is a super-2 number, since 2×21771161232² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21771161193 and 21771161202.

It is not an unprimeable number, because it can be changed into a prime (21771161233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233869 + ... + 313427.

It is an arithmetic number, because the mean of its divisors is an integer number (1406318472).

Almost surely, 2^21771161232 is an apocalyptic number.

It is an amenable number.

21771161232 is an abundant number, since it is smaller than the sum of its proper divisors (34481577648).

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

21771161232 is a wasteful number, since it uses less digits than its factorization.

21771161232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85271 (or 85265 counting only the distinct ones).

The product of its digits is 7056, while the sum is 33.

Adding to 21771161232 its reverse (23216117712), we get a palindrome (44987278944).

The spelling of 21771161232 in words is "twenty-one billion, seven hundred seventy-one million, one hundred sixty-one thousand, two hundred thirty-two".