21120020006 has 24 divisors (see below), whose sum is σ = 33787489176. Its totient is φ = 9899168000.

The previous prime is 21120019961. The next prime is 21120020029. The reversal of 21120020006 is 60002002112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72290 + ... + 217866.

It is an arithmetic number, because the mean of its divisors is an integer number (1407812049).

Almost surely, 2^21120020006 is an apocalyptic number.

21120020006 is a deficient number, since it is larger than the sum of its proper divisors (12667469170).

21120020006 is a wasteful number, since it uses less digits than its factorization.

21120020006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145864 (or 145847 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21120020006 its reverse (60002002112), we get a palindrome (81122022118).

The spelling of 21120020006 in words is "twenty-one billion, one hundred twenty million, twenty thousand, six".