21120100022002 has 4 divisors (see below), whose sum is σ = 31680150033006. Its totient is φ = 10560050011000.

The previous prime is 21120100021967. The next prime is 21120100022009. The reversal of 21120100022002 is 20022000102112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21119254433761 + 845588241 = 4595569^2 + 29079^2 .

It is not an unprimeable number, because it can be changed into a prime (21120100022009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280025005499 + ... + 5280025005502.

Almost surely, 2^{21120100022002} is an apocalyptic number.

21120100022002 is a deficient number, since it is larger than the sum of its proper divisors (10560050011004).

21120100022002 is a wasteful number, since it uses less digits than its factorization.

21120100022002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560050011003.

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

Adding to 21120100022002 its reverse (20022000102112), we get a palindrome (41142100124114).

The spelling of 21120100022002 in words is "twenty-one trillion, one hundred twenty billion, one hundred million, twenty-two thousand, two".