21211751066103 has 48 divisors (see below), whose sum is σ = 33768743168160. Its totient is φ = 12747803265792.

The previous prime is 21211751066089. The next prime is 21211751066113. The reversal of 21211751066103 is 30166015711212.

21211751066103 is a `hidden beast` number, since 2 + 1 + 21 + 1 + 7 + 5 + 10 + 6 + 610 + 3 = 666.

It is not a de Polignac number, because 21211751066103 - 2⁵ = 21211751066071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211751066113) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31813101 + ... + 32473017.

It is an arithmetic number, because the mean of its divisors is an integer number (703515482670).

Almost surely, 2^{21211751066103} is an apocalyptic number.

21211751066103 is a deficient number, since it is larger than the sum of its proper divisors (12556992102057).

21211751066103 is a wasteful number, since it uses less digits than its factorization.

21211751066103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666368 (or 666365 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

Adding to 21211751066103 its reverse (30166015711212), we get a palindrome (51377766777315).

The spelling of 21211751066103 in words is "twenty-one trillion, two hundred eleven billion, seven hundred fifty-one million, sixty-six thousand, one hundred three".