21136351488 has 576 divisors, whose sum is σ = 71425536000. Its totient is φ = 5527388160.

The previous prime is 21136351477. The next prime is 21136351499. The reversal of 21136351488 is 88415363112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21136351477) and next prime (21136351499).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 205207245 + ... + 205207347.

Almost surely, 2^21136351488 is an apocalyptic number.

21136351488 is a gapful number since it is divisible by the number (28) 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 21136351488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35712768000).

21136351488 is an abundant number, since it is smaller than the sum of its proper divisors (50289184512).

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

21136351488 is a wasteful number, since it uses less digits than its factorization.

21136351488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 175 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The spelling of 21136351488 in words is "twenty-one billion, one hundred thirty-six million, three hundred fifty-one thousand, four hundred eighty-eight".