21021120002 has 8 divisors (see below), whose sum is σ = 31533990012. Its totient is φ = 10509790000.

The previous prime is 21021119957. The next prime is 21021120011. The reversal of 21021120002 is 20002112012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20727648841 + 293471161 = 143971^2 + 17131^2 .

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

It is a super-2 number, since 2×21021120002² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350249 + ... + 405852.

Almost surely, 2^21021120002 is an apocalyptic number.

21021120002 is a deficient number, since it is larger than the sum of its proper divisors (10512870010).

21021120002 is a wasteful number, since it uses less digits than its factorization.

21021120002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770004.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21021120002 its reverse (20002112012), we get a palindrome (41023232014).

The spelling of 21021120002 in words is "twenty-one billion, twenty-one million, one hundred twenty thousand, two".