1542043021 has 24 divisors (see below), whose sum is σ = 1748377280. Its totient is φ = 1355761152.

The previous prime is 1542043001. The next prime is 1542043037. The reversal of 1542043021 is 1203402451.

It is not a de Polignac number, because 1542043021 - 2¹⁹ = 1541518733 is a prime.

It is a super-2 number, since 2×1542043021² = 4755793357229612882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1542042983 and 1542043001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1542043001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 398920 + ... + 402766.

Almost surely, 2^1542043021 is an apocalyptic number.

It is an amenable number.

1542043021 is a deficient number, since it is larger than the sum of its proper divisors (206334259).

1542043021 is a wasteful number, since it uses less digits than its factorization.

1542043021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3973 (or 3956 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1542043021 is about 39268.8556110310. The cubic root of 1542043021 is about 1155.3107915970.

Adding to 1542043021 its reverse (1203402451), we get a palindrome (2745445472).

The spelling of 1542043021 in words is "one billion, five hundred forty-two million, forty-three thousand, twenty-one".