2051243021 has 8 divisors (see below), whose sum is σ = 2159848320. Its totient is φ = 1942702272.

The previous prime is 2051242969. The next prime is 2051243027. The reversal of 2051243021 is 1203421502.

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

It is not a de Polignac number, because 2051243021 - 2²⁶ = 1984134157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2051242984 and 2051243002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051243027) 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, 57836 + ... + 86298.

It is an arithmetic number, because the mean of its divisors is an integer number (269981040).

Almost surely, 2^2051243021 is an apocalyptic number.

It is an amenable number.

2051243021 is a deficient number, since it is larger than the sum of its proper divisors (108605299).

2051243021 is a wasteful number, since it uses less digits than its factorization.

2051243021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32275.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2051243021 is about 45290.6504810872. The cubic root of 2051243021 is about 1270.5907973104.

Adding to 2051243021 its reverse (1203421502), we get a palindrome (3254664523).

The spelling of 2051243021 in words is "two billion, fifty-one million, two hundred forty-three thousand, twenty-one".