21347143488 has 448 divisors, whose sum is σ = 71162265600. Its totient is φ = 6218311680.

The previous prime is 21347143481. The next prime is 21347143507. The reversal of 21347143488 is 88434174312.

21347143488 is a `hidden beast` number, since 2 + 134 + 7 + 1 + 434 + 88 = 666.

It is a super-2 number, since 2×21347143488² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21347143481) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 89318473 + ... + 89318711.

Almost surely, 2^21347143488 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 21347143488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35581132800).

21347143488 is an abundant number, since it is smaller than the sum of its proper divisors (49815122112).

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

21347143488 is a wasteful number, since it uses less digits than its factorization.

21347143488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 419 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The spelling of 21347143488 in words is "twenty-one billion, three hundred forty-seven million, one hundred forty-three thousand, four hundred eighty-eight".