2021431402 has 8 divisors (see below), whose sum is σ = 3038105700. Its totient is φ = 1008729504.

The previous prime is 2021431309. The next prime is 2021431409. The reversal of 2021431402 is 2041341202.

It can be written as a sum of positive squares in 2 ways, for example, as 1581732441 + 439698961 = 39771^2 + 20969^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 2021431402.

It is not an unprimeable number, because it can be changed into a prime (2021431409) 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, 991827 + ... + 993862.

Almost surely, 2^2021431402 is an apocalyptic number.

2021431402 is a deficient number, since it is larger than the sum of its proper divisors (1016674298).

2021431402 is a wasteful number, since it uses less digits than its factorization.

2021431402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986200.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 2021431402 is about 44960.3314267144. The cubic root of 2021431402 is about 1264.4053826624.

Adding to 2021431402 its reverse (2041341202), we get a palindrome (4062772604).

The spelling of 2021431402 in words is "two billion, twenty-one million, four hundred thirty-one thousand, four hundred two".