21343751464 has 128 divisors (see below), whose sum is σ = 50099212800. Its totient is φ = 8316149760.

The previous prime is 21343751453. The next prime is 21343751563. The reversal of 21343751464 is 46415734312.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4017642 + ... + 4022950.

It is an arithmetic number, because the mean of its divisors is an integer number (391400100).

Almost surely, 2^21343751464 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 21343751464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25049606400).

21343751464 is an abundant number, since it is smaller than the sum of its proper divisors (28755461336).

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

21343751464 is a wasteful number, since it uses less digits than its factorization.

21343751464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5483 (or 5479 counting only the distinct ones).

The product of its digits is 241920, while the sum is 40.

The spelling of 21343751464 in words is "twenty-one billion, three hundred forty-three million, seven hundred fifty-one thousand, four hundred sixty-four".