2101201212021 has 8 divisors (see below), whose sum is σ = 2801608402560. Its totient is φ = 1400797414752.

The previous prime is 2101201212017. The next prime is 2101201212023. The reversal of 2101201212021 is 1202121021012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2101201212021 - 2² = 2101201212017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101201212023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1635316 + ... + 2622338.

It is an arithmetic number, because the mean of its divisors is an integer number (350201050320).

Almost surely, 2^{2101201212021} is an apocalyptic number.

It is an amenable number.

2101201212021 is a deficient number, since it is larger than the sum of its proper divisors (700407190539).

2101201212021 is an equidigital number, since it uses as much as digits as its factorization.

2101201212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696635.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2101201212021 its reverse (1202121021012), we get a palindrome (3303322233033).

It can be divided in two parts, 210120 and 1212021, that added together give a triangular number (1422141 = T₁₆₈₆).

The spelling of 2101201212021 in words is "two trillion, one hundred one billion, two hundred one million, two hundred twelve thousand, twenty-one".