21150134220 has 48 divisors (see below), whose sum is σ = 59261942880. Its totient is φ = 5636077056.

The previous prime is 21150134167. The next prime is 21150134249. The reversal of 21150134220 is 2243105112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37015 + ... + 208974.

It is an arithmetic number, because the mean of its divisors is an integer number (1234623810).

Almost surely, 2^21150134220 is an apocalyptic number.

21150134220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21150134220 is an abundant number, since it is smaller than the sum of its proper divisors (38111808660).

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

21150134220 is a wasteful number, since it uses less digits than its factorization.

21150134220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247434 (or 247432 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21150134220 its reverse (2243105112), we get a palindrome (23393239332).

The spelling of 21150134220 in words is "twenty-one billion, one hundred fifty million, one hundred thirty-four thousand, two hundred twenty".