742812021 has 36 divisors (see below), whose sum is σ = 1250357472. Its totient is φ = 423705744.

The previous prime is 742811977. The next prime is 742812023. The reversal of 742812021 is 120218247.

742812021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 742812021 - 2¹⁰ = 742810997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (742812023) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 326530 + ... + 328796.

It is an arithmetic number, because the mean of its divisors is an integer number (34732152).

Almost surely, 2^742812021 is an apocalyptic number.

It is an amenable number.

742812021 is a deficient number, since it is larger than the sum of its proper divisors (507545451).

742812021 is a wasteful number, since it uses less digits than its factorization.

742812021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030 (or 3020 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 742812021 is about 27254.5779824234. The cubic root of 742812021 is about 905.6484352964.

The spelling of 742812021 in words is "seven hundred forty-two million, eight hundred twelve thousand, twenty-one".