2021221912 has 8 divisors (see below), whose sum is σ = 3789791100. Its totient is φ = 1010610952.

The previous prime is 2021221901. The next prime is 2021221921. The reversal of 2021221912 is 2191221202.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126326362 + ... + 126326377.

Almost surely, 2^2021221912 is an apocalyptic number.

It is an amenable number.

2021221912 is a deficient number, since it is larger than the sum of its proper divisors (1768569188).

2021221912 is a wasteful number, since it uses less digits than its factorization.

2021221912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252652745 (or 252652741 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 2021221912 is about 44958.0016459807. The cubic root of 2021221912 is about 1264.3617024871.

It can be divided in two parts, 20212 and 21912, that added together give a palindrome (42124).

The spelling of 2021221912 in words is "two billion, twenty-one million, two hundred twenty-one thousand, nine hundred twelve".