21121121013 has 8 divisors (see below), whose sum is σ = 28848360576. Its totient is φ = 13737314400.

The previous prime is 21121120987. The next prime is 21121121039. The reversal of 21121121013 is 31012112112.

It is an interprime number because it is at equal distance from previous prime (21121120987) and next prime (21121121039).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21121121013 - 2¹⁴ = 21121104629 is a prime.

It is a super-2 number, since 2×21121121013² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121120983 and 21121121001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121121083) 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, 85858093 + ... + 85858338.

It is an arithmetic number, because the mean of its divisors is an integer number (3606045072).

Almost surely, 2^21121121013 is an apocalyptic number.

It is an amenable number.

21121121013 is a deficient number, since it is larger than the sum of its proper divisors (7727239563).

21121121013 is a wasteful number, since it uses less digits than its factorization.

21121121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171716475.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21121121013 its reverse (31012112112), we get a palindrome (52133233125).

The spelling of 21121121013 in words is "twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, thirteen".