21242143340 has 48 divisors (see below), whose sum is σ = 48692931840. Its totient is φ = 7719794880.

The previous prime is 21242143339. The next prime is 21242143369. The reversal of 21242143340 is 4334124212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351041 + ... + 407079.

It is an arithmetic number, because the mean of its divisors is an integer number (1014436080).

Almost surely, 2^21242143340 is an apocalyptic number.

21242143340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21242143340 is an abundant number, since it is smaller than the sum of its proper divisors (27450788500).

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

21242143340 is a wasteful number, since it uses less digits than its factorization.

21242143340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57782 (or 57780 counting only the distinct ones).

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

Adding to 21242143340 its reverse (4334124212), we get a palindrome (25576267552).

The spelling of 21242143340 in words is "twenty-one billion, two hundred forty-two million, one hundred forty-three thousand, three hundred forty".