21210012011005 has 8 divisors (see below), whose sum is σ = 26139906694872. Its totient is φ = 16509414754368.

The previous prime is 21210012010939. The next prime is 21210012011047. The reversal of 21210012011005 is 50011021001212.

It can be written as a sum of positive squares in 4 ways, for example, as 6861355897561 + 14348656113444 = 2619419^2 + 3787962^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21210012011005 - 2²¹ = 21210009913853 is a prime.

It is a super-2 number, since 2×21210012011005² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210012011005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57324356602 + ... + 57324356971.

It is an arithmetic number, because the mean of its divisors is an integer number (3267488336859).

Almost surely, 2^{21210012011005} is an apocalyptic number.

It is an amenable number.

21210012011005 is a deficient number, since it is larger than the sum of its proper divisors (4929894683867).

21210012011005 is a wasteful number, since it uses less digits than its factorization.

21210012011005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114648713615.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 21210012011005 its reverse (50011021001212), we get a palindrome (71221033012217).

The spelling of 21210012011005 in words is "twenty-one trillion, two hundred ten billion, twelve million, eleven thousand, five".