21111020030 has 16 divisors (see below), whose sum is σ = 38004699744. Its totient is φ = 8443327200.

The previous prime is 21111020009. The next prime is 21111020039. The reversal of 21111020030 is 3002011112.

It is a super-2 number, since 2×21111020030² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21111019993 and 21111020020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111020039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50546 + ... + 211605.

It is an arithmetic number, because the mean of its divisors is an integer number (2375293734).

Almost surely, 2^21111020030 is an apocalyptic number.

21111020030 is a deficient number, since it is larger than the sum of its proper divisors (16893679714).

21111020030 is a wasteful number, since it uses less digits than its factorization.

21111020030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270211.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21111020030 its reverse (3002011112), we get a palindrome (24113031142).

The spelling of 21111020030 in words is "twenty-one billion, one hundred eleven million, twenty thousand, thirty".