21310619784 has 64 divisors (see below), whose sum is σ = 54158442240. Its totient is φ = 6986295360.

The previous prime is 21310619783. The next prime is 21310619839. The reversal of 21310619784 is 48791601312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21310619783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1023639 + ... + 1044249.

It is an arithmetic number, because the mean of its divisors is an integer number (846225660).

Almost surely, 2^21310619784 is an apocalyptic number.

21310619784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21310619784 is an abundant number, since it is smaller than the sum of its proper divisors (32847822456).

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

21310619784 is a wasteful number, since it uses less digits than its factorization.

21310619784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21330 (or 21326 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 21310619784 in words is "twenty-one billion, three hundred ten million, six hundred nineteen thousand, seven hundred eighty-four".