21203064411205 has 16 divisors (see below), whose sum is σ = 25766029267200. Its totient is φ = 16747554882240.

The previous prime is 21203064411181. The next prime is 21203064411209. The reversal of 21203064411205 is 50211446030212.

It is not a de Polignac number, because 21203064411205 - 2⁵ = 21203064411173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203064411209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44960935 + ... + 45430075.

It is an arithmetic number, because the mean of its divisors is an integer number (1610376829200).

Almost surely, 2^{21203064411205} is an apocalyptic number.

It is an amenable number.

21203064411205 is a deficient number, since it is larger than the sum of its proper divisors (4562964855995).

21203064411205 is a wasteful number, since it uses less digits than its factorization.

21203064411205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583644.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 21203064411205 in words is "twenty-one trillion, two hundred three billion, sixty-four million, four hundred eleven thousand, two hundred five".