21011034 has 16 divisors (see below), whose sum is σ = 45842400. Its totient is φ = 6366960.

The previous prime is 21011033. The next prime is 21011063. The reversal of 21011034 is 43011012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21011033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159109 + ... + 159240.

It is an arithmetic number, because the mean of its divisors is an integer number (2865150).

Almost surely, 2^21011034 is an apocalyptic number.

21011034 is an abundant number, since it is smaller than the sum of its proper divisors (24831366).

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

21011034 is a wasteful number, since it uses less digits than its factorization.

21011034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318365.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21011034 is about 4583.7794449559. The cubic root of 21011034 is about 275.9407297639.

Adding to 21011034 its reverse (43011012), we get a palindrome (64022046).

The spelling of 21011034 in words is "twenty-one million, eleven thousand, thirty-four".