2021023142 has 4 divisors (see below), whose sum is σ = 3031534716. Its totient is φ = 1010511570.

The previous prime is 2021023099. The next prime is 2021023153. The reversal of 2021023142 is 2413201202.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2021023142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505255784 + ... + 505255787.

It is an arithmetic number, because the mean of its divisors is an integer number (757883679).

Almost surely, 2^2021023142 is an apocalyptic number.

2021023142 is a deficient number, since it is larger than the sum of its proper divisors (1010511574).

2021023142 is a wasteful number, since it uses less digits than its factorization.

2021023142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010511573.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2021023142 is about 44955.7909729103. The cubic root of 2021023142 is about 1264.3202547184.

Adding to 2021023142 its reverse (2413201202), we get a palindrome (4434224344).

The spelling of 2021023142 in words is "two billion, twenty-one million, twenty-three thousand, one hundred forty-two".