21121535003 has 8 divisors (see below), whose sum is σ = 22263541200. Its totient is φ = 19982563488.

The previous prime is 21121534999. The next prime is 21121535069. The reversal of 21121535003 is 30053512112.

It is a happy number.

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 21121535003 - 2² = 21121534999 is a prime.

It is a super-2 number, since 2×21121535003² (a number of 21 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 21121535003.

It is not an unprimeable number, because it can be changed into a prime (21121535203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 744368 + ... + 772221.

It is an arithmetic number, because the mean of its divisors is an integer number (2782942650).

Almost surely, 2^21121535003 is an apocalyptic number.

21121535003 is a deficient number, since it is larger than the sum of its proper divisors (1142006197).

21121535003 is a wasteful number, since it uses less digits than its factorization.

21121535003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517341.

The product of its (nonzero) digits is 900, while the sum is 23.

The spelling of 21121535003 in words is "twenty-one billion, one hundred twenty-one million, five hundred thirty-five thousand, three".