2021221212102 has 24 divisors (see below), whose sum is σ = 4380213723600. Its totient is φ = 673601773680.

The previous prime is 2021221212083. The next prime is 2021221212107. The reversal of 2021221212102 is 2012121221202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021221212107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11462602 + ... + 11637597.

It is an arithmetic number, because the mean of its divisors is an integer number (182508905150).

Almost surely, 2^{2021221212102} is an apocalyptic number.

2021221212102 is an abundant number, since it is smaller than the sum of its proper divisors (2358992511498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021221212102 is a wasteful number, since it uses less digits than its factorization.

2021221212102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23105068 (or 23105065 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2021221212102 its reverse (2012121221202), we get a palindrome (4033342433304).

The spelling of 2021221212102 in words is "two trillion, twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, one hundred two".