21661042106462 has 16 divisors (see below), whose sum is σ = 35662797718272. Its totient is φ = 9785523760920.

The previous prime is 21661042106447. The next prime is 21661042106491. The reversal of 21661042106462 is 26460124016612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3020219798 + ... + 3020226969.

It is an arithmetic number, because the mean of its divisors is an integer number (2228924857392).

Almost surely, 2^{21661042106462} is an apocalyptic number.

21661042106462 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21661042106462 is a deficient number, since it is larger than the sum of its proper divisors (14001755611810).

21661042106462 is a wasteful number, since it uses less digits than its factorization.

21661042106462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6040446943.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 21661042106462 in words is "twenty-one trillion, six hundred sixty-one billion, forty-two million, one hundred six thousand, four hundred sixty-two".