21221010002005 has 32 divisors (see below), whose sum is σ = 29226927679488. Its totient is φ = 14650088947200.

The previous prime is 21221010001999. The next prime is 21221010002011. The reversal of 21221010002005 is 50020001012212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21221010001999) and next prime (21221010002011).

It is not a de Polignac number, because 21221010002005 - 2⁹ = 21221010001493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221010002005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127087477 + ... + 127254346.

It is an arithmetic number, because the mean of its divisors is an integer number (913341489984).

Almost surely, 2^{21221010002005} is an apocalyptic number.

It is an amenable number.

21221010002005 is a deficient number, since it is larger than the sum of its proper divisors (8005917677483).

21221010002005 is a wasteful number, since it uses less digits than its factorization.

21221010002005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254341917.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 21221010002005 its reverse (50020001012212), we get a palindrome (71241011014217).

The spelling of 21221010002005 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, two thousand, five".