21120021220102 has 16 divisors (see below), whose sum is σ = 36355981999392. Its totient is φ = 9013879831680.

The previous prime is 21120021220073. The next prime is 21120021220141. The reversal of 21120021220102 is 20102212002112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3129816013 + ... + 3129822760.

It is an arithmetic number, because the mean of its divisors is an integer number (2272248874962).

Almost surely, 2^{21120021220102} is an apocalyptic number.

21120021220102 is a deficient number, since it is larger than the sum of its proper divisors (15235960779290).

21120021220102 is a wasteful number, since it uses less digits than its factorization.

21120021220102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6259639023.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21120021220102 its reverse (20102212002112), we get a palindrome (41222233222214).

The spelling of 21120021220102 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, two hundred twenty thousand, one hundred two".