21611170261742 has 32 divisors (see below), whose sum is σ = 32944386408960. Its totient is φ = 10630145211840.

The previous prime is 21611170261729. The next prime is 21611170261777. The reversal of 21611170261742 is 24716207111612.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21611170261742.

It is a congruent number.

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, 397741517 + ... + 397795847.

It is an arithmetic number, because the mean of its divisors is an integer number (1029512075280).

Almost surely, 2^{21611170261742} is an apocalyptic number.

21611170261742 is a deficient number, since it is larger than the sum of its proper divisors (11333216147218).

21611170261742 is a wasteful number, since it uses less digits than its factorization.

21611170261742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58296.

The product of its (nonzero) digits is 56448, while the sum is 41.

The spelling of 21611170261742 in words is "twenty-one trillion, six hundred eleven billion, one hundred seventy million, two hundred sixty-one thousand, seven hundred forty-two".