21346420576 has 24 divisors (see below), whose sum is σ = 45258517584. Its totient is φ = 9852193920.

The previous prime is 21346420559. The next prime is 21346420639. The reversal of 21346420576 is 67502464312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25656340 + ... + 25657171.

It is an arithmetic number, because the mean of its divisors is an integer number (1885771566).

Almost surely, 2^21346420576 is an apocalyptic number.

21346420576 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21346420576 is an abundant number, since it is smaller than the sum of its proper divisors (23912097008).

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

21346420576 is a wasteful number, since it uses less digits than its factorization.

21346420576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51313534 (or 51313526 counting only the distinct ones).

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

Adding to 21346420576 its reverse (67502464312), we get a palindrome (88848884888).

The spelling of 21346420576 in words is "twenty-one billion, three hundred forty-six million, four hundred twenty thousand, five hundred seventy-six".