2021620213 has 4 divisors (see below), whose sum is σ = 2109516768. Its totient is φ = 1933723660.

The previous prime is 2021620193. The next prime is 2021620219. The reversal of 2021620213 is 3120261202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021620213 - 2⁹ = 2021619701 is a prime.

It is a super-2 number, since 2×2021620213² = 8173896571220330738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021620219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43948243 + ... + 43948288.

It is an arithmetic number, because the mean of its divisors is an integer number (527379192).

Almost surely, 2^2021620213 is an apocalyptic number.

2021620213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2021620213 is a deficient number, since it is larger than the sum of its proper divisors (87896555).

2021620213 is an equidigital number, since it uses as much as digits as its factorization.

2021620213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87896554.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2021620213 is about 44962.4311286656. The cubic root of 2021620213 is about 1264.4447485316. Note that the first 3 decimals are identical.

Adding to 2021620213 its reverse (3120261202), we get a palindrome (5141881415).

The spelling of 2021620213 in words is "two billion, twenty-one million, six hundred twenty thousand, two hundred thirteen".