21120020007 has 8 divisors (see below), whose sum is σ = 28190941440. Its totient is φ = 14064555960.

The previous prime is 21120019961. The next prime is 21120020029. The reversal of 21120020007 is 70002002112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21120020007 - 2¹⁸ = 21119757863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120020087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3861157 + ... + 3866622.

It is an arithmetic number, because the mean of its divisors is an integer number (3523867680).

Almost surely, 2^21120020007 is an apocalyptic number.

21120020007 is a deficient number, since it is larger than the sum of its proper divisors (7070921433).

21120020007 is an equidigital number, since it uses as much as digits as its factorization.

21120020007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7728693.

The product of its (nonzero) digits is 56, while the sum is 15.

Adding to 21120020007 its reverse (70002002112), we get a palindrome (91122022119).

The spelling of 21120020007 in words is "twenty-one billion, one hundred twenty million, twenty thousand, seven".