21375064535510 has 64 divisors (see below), whose sum is σ = 44001128586240. Its totient is φ = 7323667021440.

The previous prime is 21375064535441. The next prime is 21375064535519. The reversal of 21375064535510 is 1553546057312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375064535519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1266962375 + ... + 1266979245.

It is an arithmetic number, because the mean of its divisors is an integer number (687517634160).

Almost surely, 2^{21375064535510} is an apocalyptic number.

21375064535510 is an abundant number, since it is smaller than the sum of its proper divisors (22626064050730).

21375064535510 is a wasteful number, since it uses less digits than its factorization.

21375064535510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27981.

The product of its (nonzero) digits is 1890000, while the sum is 47.

The spelling of 21375064535510 in words is "twenty-one trillion, three hundred seventy-five billion, sixty-four million, five hundred thirty-five thousand, five hundred ten".