21121001201005 has 32 divisors (see below), whose sum is σ = 25808496721920. Its totient is φ = 16590038928960.

The previous prime is 21121001200991. The next prime is 21121001201029. The reversal of 21121001201005 is 50010210012112.

It is not a de Polignac number, because 21121001201005 - 2²⁹ = 21120464330093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21121001201005.

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, 89483074 + ... + 89718796.

It is an arithmetic number, because the mean of its divisors is an integer number (806515522560).

Almost surely, 2^{21121001201005} is an apocalyptic number.

It is an amenable number.

21121001201005 is a deficient number, since it is larger than the sum of its proper divisors (4687495520915).

21121001201005 is a wasteful number, since it uses less digits than its factorization.

21121001201005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236841.

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

Adding to 21121001201005 its reverse (50010210012112), we get a palindrome (71131211213117).

The spelling of 21121001201005 in words is "twenty-one trillion, one hundred twenty-one billion, one million, two hundred one thousand, five".