21031121030 has 32 divisors (see below), whose sum is σ = 39279889440. Its totient is φ = 8097788160.

The previous prime is 21031121017. The next prime is 21031121047. The reversal of 21031121030 is 3012113012.

It is a junction number, because it is equal to n+sod(n) for n = 21031120996 and 21031121014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13559 + ... + 205538.

It is an arithmetic number, because the mean of its divisors is an integer number (1227496545).

Almost surely, 2^21031121030 is an apocalyptic number.

21031121030 is a deficient number, since it is larger than the sum of its proper divisors (18248768410).

21031121030 is a wasteful number, since it uses less digits than its factorization.

21031121030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219464.

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

Adding to 21031121030 its reverse (3012113012), we get a palindrome (24043234042).

The spelling of 21031121030 in words is "twenty-one billion, thirty-one million, one hundred twenty-one thousand, thirty".