21121155381003 has 16 divisors (see below), whose sum is σ = 28225598544000. Its totient is φ = 14048744209920.

The previous prime is 21121155380993. The next prime is 21121155381077. The reversal of 21121155381003 is 30018355112112.

It is not a de Polignac number, because 21121155381003 - 2¹⁴ = 21121155364619 is a prime.

It is a super-2 number, since 2×21121155381003² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121155382003) 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, 28921788 + ... + 29643078.

It is an arithmetic number, because the mean of its divisors is an integer number (1764099909000).

Almost surely, 2^{21121155381003} is an apocalyptic number.

21121155381003 is a deficient number, since it is larger than the sum of its proper divisors (7104443162997).

21121155381003 is a wasteful number, since it uses less digits than its factorization.

21121155381003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743482.

The product of its (nonzero) digits is 7200, while the sum is 33.

The spelling of 21121155381003 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred fifty-five million, three hundred eighty-one thousand, three".