21342155460 has 48 divisors (see below), whose sum is σ = 62903198400. Its totient is φ = 5391702144.

The previous prime is 21342155431. The next prime is 21342155489. The reversal of 21342155460 is 6455124312.

It is an interprime number because it is at equal distance from previous prime (21342155431) and next prime (21342155489).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9359455 + ... + 9361734.

It is an arithmetic number, because the mean of its divisors is an integer number (1310483300).

Almost surely, 2^21342155460 is an apocalyptic number.

21342155460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21342155460 is an abundant number, since it is smaller than the sum of its proper divisors (41561042940).

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

21342155460 is a wasteful number, since it uses less digits than its factorization.

21342155460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18721220 (or 18721218 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 21342155460 its reverse (6455124312), we get a palindrome (27797279772).

The spelling of 21342155460 in words is "twenty-one billion, three hundred forty-two million, one hundred fifty-five thousand, four hundred sixty".