21345443510 has 16 divisors (see below), whose sum is σ = 38456652096. Its totient is φ = 8530432128.

The previous prime is 21345443507. The next prime is 21345443563. The reversal of 21345443510 is 1534454312.

It is a super-2 number, since 2×21345443510² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 956579 + ... + 978638.

It is an arithmetic number, because the mean of its divisors is an integer number (2403540756).

Almost surely, 2^21345443510 is an apocalyptic number.

21345443510 is a deficient number, since it is larger than the sum of its proper divisors (17111208586).

21345443510 is a wasteful number, since it uses less digits than its factorization.

21345443510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936327.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 21345443510 its reverse (1534454312), we get a palindrome (22879897822).

The spelling of 21345443510 in words is "twenty-one billion, three hundred forty-five million, four hundred forty-three thousand, five hundred ten".