21121311003 has 64 divisors (see below), whose sum is σ = 33222131712. Its totient is φ = 11812055040.

The previous prime is 21121310957. The next prime is 21121311011. The reversal of 21121311003 is 30011312112.

It is a happy number.

It is not a de Polignac number, because 21121311003 - 2⁹ = 21121310491 is a prime.

It is a super-2 number, since 2×21121311003² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121311053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12474825 + ... + 12476517.

It is an arithmetic number, because the mean of its divisors is an integer number (519095808).

Almost surely, 2^21121311003 is an apocalyptic number.

21121311003 is a deficient number, since it is larger than the sum of its proper divisors (12100820709).

21121311003 is a wasteful number, since it uses less digits than its factorization.

21121311003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21121311003 its reverse (30011312112), we get a palindrome (51132623115).

The spelling of 21121311003 in words is "twenty-one billion, one hundred twenty-one million, three hundred eleven thousand, three".