21502444045511 has 32 divisors (see below), whose sum is σ = 25635969737280. Its totient is φ = 17884325222400.

The previous prime is 21502444045487. The next prime is 21502444045519. The reversal of 21502444045511 is 11554044420512.

It is not a de Polignac number, because 21502444045511 - 2¹⁴ = 21502444029127 is a prime.

It is a super-2 number, since 2×21502444045511² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21502444045519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1206050 + ... + 6667791.

It is an arithmetic number, because the mean of its divisors is an integer number (801124054290).

Almost surely, 2^{21502444045511} is an apocalyptic number.

21502444045511 is a deficient number, since it is larger than the sum of its proper divisors (4133525691769).

21502444045511 is a wasteful number, since it uses less digits than its factorization.

21502444045511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7874004 (or 7873978 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 38.

The spelling of 21502444045511 in words is "twenty-one trillion, five hundred two billion, four hundred forty-four million, forty-five thousand, five hundred eleven".