21120021034 has 16 divisors (see below), whose sum is σ = 36218040768. Its totient is φ = 9048364992.

The previous prime is 21120021029. The next prime is 21120021037. The reversal of 21120021034 is 43012002112.

It is a junction number, because it is equal to n+sod(n) for n = 21120020999 and 21120021017.

It is not an unprimeable number, because it can be changed into a prime (21120021037) 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, 213087 + ... + 296050.

It is an arithmetic number, because the mean of its divisors is an integer number (2263627548).

Almost surely, 2^21120021034 is an apocalyptic number.

21120021034 is a deficient number, since it is larger than the sum of its proper divisors (15098019734).

21120021034 is a wasteful number, since it uses less digits than its factorization.

21120021034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512109.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21120021034 its reverse (43012002112), we get a palindrome (64132023146).

The spelling of 21120021034 in words is "twenty-one billion, one hundred twenty million, twenty-one thousand, thirty-four".