21211022316 has 96 divisors (see below), whose sum is σ = 54385164288. Its totient is φ = 6380919360.

The previous prime is 21211022311. The next prime is 21211022317. The reversal of 21211022316 is 61322011212.

It is a junction number, because it is equal to n+sod(n) for n = 21211022292 and 21211022301.

It is not an unprimeable number, because it can be changed into a prime (21211022311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13745841 + ... + 13747383.

It is an arithmetic number, because the mean of its divisors is an integer number (566512128).

Almost surely, 2^21211022316 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21211022316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27192582144).

21211022316 is an abundant number, since it is smaller than the sum of its proper divisors (33174141972).

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

21211022316 is a wasteful number, since it uses less digits than its factorization.

21211022316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251 (or 2249 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21211022316 its reverse (61322011212), we get a palindrome (82533033528).

The spelling of 21211022316 in words is "twenty-one billion, two hundred eleven million, twenty-two thousand, three hundred sixteen".