2021402434 has 4 divisors (see below), whose sum is σ = 3032103654. Its totient is φ = 1010701216.

The previous prime is 2021402431. The next prime is 2021402491. The reversal of 2021402434 is 4342041202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4342041202 = 2 ⋅2171020601.

It can be written as a sum of positive squares in only one way, i.e., 1142102025 + 879300409 = 33795^2 + 29653^2 .

It is a super-2 number, since 2×2021402434² = 8172135600362248712, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2021402431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505350607 + ... + 505350610.

Almost surely, 2^2021402434 is an apocalyptic number.

2021402434 is a deficient number, since it is larger than the sum of its proper divisors (1010701220).

2021402434 is a wasteful number, since it uses less digits than its factorization.

2021402434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010701219.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 2021402434 is about 44960.0092749101. The cubic root of 2021402434 is about 1264.3993428054.

Adding to 2021402434 its reverse (4342041202), we get a palindrome (6363443636).

The spelling of 2021402434 in words is "two billion, twenty-one million, four hundred two thousand, four hundred thirty-four".