21002034 has 16 divisors (see below), whose sum is σ = 42095520. Its totient is φ = 6985440.

The previous prime is 21001991. The next prime is 21002039. The reversal of 21002034 is 43020012.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21002039) 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 7 ways as a sum of consecutive naturals, for example, 619 + ... + 6510.

It is an arithmetic number, because the mean of its divisors is an integer number (2630970).

Almost surely, 2^21002034 is an apocalyptic number.

21002034 is an abundant number, since it is smaller than the sum of its proper divisors (21093486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21002034 is a wasteful number, since it uses less digits than its factorization.

21002034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7625.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21002034 is about 4582.7976171767. The cubic root of 21002034 is about 275.9013247343.

Adding to 21002034 its reverse (43020012), we get a palindrome (64022046).

The spelling of 21002034 in words is "twenty-one million, two thousand, thirty-four".