2021212121202 has 24 divisors (see below), whose sum is σ = 4379396141484. Its totient is φ = 673721494944.

The previous prime is 2021212121177. The next prime is 2021212121209.

It is a happy number.

2021212121202 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 1998799336521 + 22412784681 = 1413789^2 + 149709^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2021212121209) 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, 525273 + ... + 2078060.

Almost surely, 2^{2021212121202} is an apocalyptic number.

2021212121202 is an abundant number, since it is smaller than the sum of its proper divisors (2358184020282).

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

2021212121202 is a wasteful number, since it uses less digits than its factorization.

2021212121202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2646474 (or 2646471 counting only the distinct ones).

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

The spelling of 2021212121202 in words is "two trillion, twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred two".