21121321030 has 16 divisors (see below), whose sum is σ = 38081858400. Its totient is φ = 8434421632.

The previous prime is 21121321019. The next prime is 21121321031. The reversal of 21121321030 is 3012312112.

It is a super-2 number, since 2×21121321030² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121320995 and 21121321013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121321031) 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, 1757059 + ... + 1769038.

It is an arithmetic number, because the mean of its divisors is an integer number (2380116150).

Almost surely, 2^21121321030 is an apocalyptic number.

21121321030 is a deficient number, since it is larger than the sum of its proper divisors (16960537370).

21121321030 is a wasteful number, since it uses less digits than its factorization.

21121321030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3526703.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21121321030 its reverse (3012312112), we get a palindrome (24133633142).

The spelling of 21121321030 in words is "twenty-one billion, one hundred twenty-one million, three hundred twenty-one thousand, thirty".