2121749 has 24 divisors (see below), whose sum is σ = 2708640. Its totient is φ = 1651104.

The previous prime is 2121739. The next prime is 2121751. The reversal of 2121749 is 9471212.

It is not a de Polignac number, because 2121749 - 2¹² = 2117653 is a prime.

2121749 is a modest number, since divided by 1749 gives 212 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40007 + ... + 40059.

It is an arithmetic number, because the mean of its divisors is an integer number (112860).

2^2121749 is an apocalyptic number.

It is an amenable number.

2121749 is a deficient number, since it is larger than the sum of its proper divisors (586891).

2121749 is a wasteful number, since it uses less digits than its factorization.

2121749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 122 counting only the distinct ones).

The product of its digits is 1008, while the sum is 26.

The square root of 2121749 is about 1456.6224630974. The cubic root of 2121749 is about 128.4984834313.

The spelling of 2121749 in words is "two million, one hundred twenty-one thousand, seven hundred forty-nine".