2061220021 has 4 divisors (see below), whose sum is σ = 2355680032. Its totient is φ = 1766760012.

The previous prime is 2061220009. The next prime is 2061220079. The reversal of 2061220021 is 1200221602.

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 2061220021 - 2⁵ = 2061219989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2061219977 and 2061220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2061220001) 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, 147229995 + ... + 147230008.

It is an arithmetic number, because the mean of its divisors is an integer number (588920008).

Almost surely, 2^2061220021 is an apocalyptic number.

It is an amenable number.

2061220021 is a deficient number, since it is larger than the sum of its proper divisors (294460011).

2061220021 is an equidigital number, since it uses as much as digits as its factorization.

2061220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294460010.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2061220021 is about 45400.6610194169. The cubic root of 2061220021 is about 1272.6474668498.

Adding to 2061220021 its reverse (1200221602), we get a palindrome (3261441623).

The spelling of 2061220021 in words is "two billion, sixty-one million, two hundred twenty thousand, twenty-one".