2102242212021 has 16 divisors (see below), whose sum is σ = 3203565858944. Its totient is φ = 1201225330944.

The previous prime is 2102242212017. The next prime is 2102242212079. The reversal of 2102242212021 is 1202122422012.

It is not a de Polignac number, because 2102242212021 - 2² = 2102242212017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102242212121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1866640 + ... + 2772873.

It is an arithmetic number, because the mean of its divisors is an integer number (200222866184).

Almost surely, 2^{2102242212021} is an apocalyptic number.

2102242212021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2102242212021 is a deficient number, since it is larger than the sum of its proper divisors (1101323646923).

2102242212021 is a wasteful number, since it uses less digits than its factorization.

2102242212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4661100.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 2102242212021 its reverse (1202122422012), we get a palindrome (3304364634033).

The spelling of 2102242212021 in words is "two trillion, one hundred two billion, two hundred forty-two million, two hundred twelve thousand, twenty-one".