21121130215403 has 4 divisors (see below), whose sum is σ = 21121205302800. Its totient is φ = 21121055128008.

The previous prime is 21121130215363. The next prime is 21121130215477. The reversal of 21121130215403 is 30451203112112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21121130215403 - 2⁸ = 21121130215147 is a prime.

It is a super-2 number, since 2×21121130215403² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121130245403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37120175 + ... + 37684872.

It is an arithmetic number, because the mean of its divisors is an integer number (5280301325700).

Almost surely, 2^{21121130215403} is an apocalyptic number.

21121130215403 is a deficient number, since it is larger than the sum of its proper divisors (75087397).

21121130215403 is an equidigital number, since it uses as much as digits as its factorization.

21121130215403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75087396.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 21121130215403 its reverse (30451203112112), we get a palindrome (51572333327515).

The spelling of 21121130215403 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred thirty million, two hundred fifteen thousand, four hundred three".