21401305136 has 40 divisors (see below), whose sum is σ = 41937680400. Its totient is φ = 10579322880.

The previous prime is 21401305127. The next prime is 21401305181. The reversal of 21401305136 is 63150310412.

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, 516020 + ... + 555948.

It is an arithmetic number, because the mean of its divisors is an integer number (1048442010).

Almost surely, 2^21401305136 is an apocalyptic number.

It is an amenable number.

21401305136 is a deficient number, since it is larger than the sum of its proper divisors (20536375264).

21401305136 is a wasteful number, since it uses less digits than its factorization.

21401305136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40317 (or 40311 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 21401305136 its reverse (63150310412), we get a palindrome (84551615548).

The spelling of 21401305136 in words is "twenty-one billion, four hundred one million, three hundred five thousand, one hundred thirty-six".