21343124240 has 40 divisors (see below), whose sum is σ = 49737446808. Its totient is φ = 8517519360.

The previous prime is 21343124239. The next prime is 21343124293. The reversal of 21343124240 is 4242134312.

It can be written as a sum of positive squares in 4 ways, for example, as 1293697024 + 20049427216 = 35968^2 + 141596^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273431 + ... + 342710.

Almost surely, 2^21343124240 is an apocalyptic number.

21343124240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21343124240 is an abundant number, since it is smaller than the sum of its proper divisors (28394322568).

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

21343124240 is a wasteful number, since it uses less digits than its factorization.

21343124240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616587 (or 616581 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21343124240 its reverse (4242134312), we get a palindrome (25585258552).

The spelling of 21343124240 in words is "twenty-one billion, three hundred forty-three million, one hundred twenty-four thousand, two hundred forty".