13121030021 has 8 divisors (see below), whose sum is σ = 14700712224. Its totient is φ = 11605824720.

The previous prime is 13121030011. The next prime is 13121030029. The reversal of 13121030021 is 12003012131.

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 13121030021 - 2¹⁴ = 13121013637 is a prime.

It is a super-2 number, since 2×13121030021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13121029978 and 13121030005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121030029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16118795 + ... + 16119608.

It is an arithmetic number, because the mean of its divisors is an integer number (1837589028).

Almost surely, 2^13121030021 is an apocalyptic number.

13121030021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13121030021 is a deficient number, since it is larger than the sum of its proper divisors (1579682203).

13121030021 is a wasteful number, since it uses less digits than its factorization.

13121030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32238451.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 13121030021 its reverse (12003012131), we get a palindrome (25124042152).

The spelling of 13121030021 in words is "thirteen billion, one hundred twenty-one million, thirty thousand, twenty-one".