21212201160 has 384 divisors, whose sum is σ = 76502361600. Its totient is φ = 5224227840.

The previous prime is 21212201159. The next prime is 21212201209. The reversal of 21212201160 is 6110221212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15984417 + ... + 15985743.

It is an arithmetic number, because the mean of its divisors is an integer number (199224900).

Almost surely, 2^21212201160 is an apocalyptic number.

21212201160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21212201160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38251180800).

21212201160 is an abundant number, since it is smaller than the sum of its proper divisors (55290160440).

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

21212201160 is a wasteful number, since it uses less digits than its factorization.

21212201160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426 (or 1397 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21212201160 its reverse (6110221212), we get a palindrome (27322422372).

The spelling of 21212201160 in words is "twenty-one billion, two hundred twelve million, two hundred one thousand, one hundred sixty".