9942021 has 10 divisors (see below), whose sum is σ = 14851782. Its totient is φ = 6627960.

The previous prime is 9942013. The next prime is 9942029. The reversal of 9942021 is 1202499.

It is an interprime number because it is at equal distance from previous prime (9942013) and next prime (9942029).

It can be written as a sum of positive squares in only one way, i.e., 9696996 + 245025 = 3114^2 + 495^2 .

It is not a de Polignac number, because 9942021 - 2³ = 9942013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9942029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 61290 + ... + 61451.

Almost surely, 2^9942021 is an apocalyptic number.

It is an amenable number.

9942021 is a deficient number, since it is larger than the sum of its proper divisors (4909761).

9942021 is a wasteful number, since it uses less digits than its factorization.

9942021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122753 (or 122744 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 9942021 is about 3153.0970489346. The cubic root of 9942021 is about 215.0262884747.

The spelling of 9942021 in words is "nine million, nine hundred forty-two thousand, twenty-one".