21021221102102 has 24 divisors (see below), whose sum is σ = 35497955622864. Its totient is φ = 9280271517264.

The previous prime is 21021221102083. The next prime is 21021221102117. The reversal of 21021221102102 is 20120112212012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 764171978 + ... + 764199485.

It is an arithmetic number, because the mean of its divisors is an integer number (1479081484286).

Almost surely, 2^{21021221102102} is an apocalyptic number.

21021221102102 is a deficient number, since it is larger than the sum of its proper divisors (14476734520762).

21021221102102 is a wasteful number, since it uses less digits than its factorization.

21021221102102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528371524 (or 1528371501 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21021221102102 its reverse (20120112212012), we get a palindrome (41141333314114).

The spelling of 21021221102102 in words is "twenty-one trillion, twenty-one billion, two hundred twenty-one million, one hundred two thousand, one hundred two".