2105211021 has 8 divisors (see below), whose sum is σ = 2811989664. Its totient is φ = 1400953200.

The previous prime is 2105210993. The next prime is 2105211049. The reversal of 2105211021 is 1201125012.

It is an interprime number because it is at equal distance from previous prime (2105210993) and next prime (2105211049).

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

It is not a de Polignac number, because 2105211021 - 2⁶ = 2105210957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105211061) 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, 628255 + ... + 631596.

It is an arithmetic number, because the mean of its divisors is an integer number (351498708).

Almost surely, 2^2105211021 is an apocalyptic number.

It is an amenable number.

2105211021 is a deficient number, since it is larger than the sum of its proper divisors (706778643).

2105211021 is a wasteful number, since it uses less digits than its factorization.

2105211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260411.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 2105211021 is about 45882.5786219563. The cubic root of 2105211021 is about 1281.6375162363.

Adding to 2105211021 its reverse (1201125012), we get a palindrome (3306336033).

The spelling of 2105211021 in words is "two billion, one hundred five million, two hundred eleven thousand, twenty-one".