21120221002 has 8 divisors (see below), whose sum is σ = 32062022496. Its totient is φ = 10432880172.

The previous prime is 21120220987. The next prime is 21120221009. The reversal of 21120221002 is 20012202112.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21120221009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63614958 + ... + 63615289.

It is an arithmetic number, because the mean of its divisors is an integer number (4007752812).

Almost surely, 2^21120221002 is an apocalyptic number.

21120221002 is a deficient number, since it is larger than the sum of its proper divisors (10941801494).

21120221002 is a wasteful number, since it uses less digits than its factorization.

21120221002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127230332.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21120221002 its reverse (20012202112), we get a palindrome (41132423114).

The spelling of 21120221002 in words is "twenty-one billion, one hundred twenty million, two hundred twenty-one thousand, two".