21121000111030 has 16 divisors (see below), whose sum is σ = 38025491529024. Its totient is φ = 8446690860160.

The previous prime is 21121000111007. The next prime is 21121000111073. The reversal of 21121000111030 is 3011100012112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121000111030.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213596131 + ... + 213694990.

It is an arithmetic number, because the mean of its divisors is an integer number (2376593220564).

Almost surely, 2^{21121000111030} is an apocalyptic number.

21121000111030 is a deficient number, since it is larger than the sum of its proper divisors (16904491417994).

21121000111030 is a wasteful number, since it uses less digits than its factorization.

21121000111030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427296071.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21121000111030 its reverse (3011100012112), we get a palindrome (24132100123142).

The spelling of 21121000111030 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven thousand, thirty".