21151045655270 has 64 divisors (see below), whose sum is σ = 38802191339520. Its totient is φ = 8299538702208.

The previous prime is 21151045655231. The next prime is 21151045655381. The reversal of 21151045655270 is 7255654015112.

It is a super-2 number, since 2×21151045655270² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 452860739 + ... + 452907441.

It is an arithmetic number, because the mean of its divisors is an integer number (606284239680).

Almost surely, 2^{21151045655270} is an apocalyptic number.

21151045655270 is a deficient number, since it is larger than the sum of its proper divisors (17651145684250).

21151045655270 is a wasteful number, since it uses less digits than its factorization.

21151045655270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50469.

The product of its (nonzero) digits is 420000, while the sum is 44.

The spelling of 21151045655270 in words is "twenty-one trillion, one hundred fifty-one billion, forty-five million, six hundred fifty-five thousand, two hundred seventy".