21012134 has 24 divisors (see below), whose sum is σ = 37314480. Its totient is φ = 8814960.

The previous prime is 21012127. The next prime is 21012137. The reversal of 21012134 is 43121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012137) 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 11 ways as a sum of consecutive naturals, for example, 194 + ... + 6485.

It is an arithmetic number, because the mean of its divisors is an integer number (1554770).

Almost surely, 2^21012134 is an apocalyptic number.

21012134 is a deficient number, since it is larger than the sum of its proper divisors (16302346).

21012134 is a wasteful number, since it uses less digits than its factorization.

21012134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6716 (or 6705 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21012134 is about 4583.8994317066. The cubic root of 21012134 is about 275.9455451624.

Adding to 21012134 its reverse (43121012), we get a palindrome (64133146).

The spelling of 21012134 in words is "twenty-one million, twelve thousand, one hundred thirty-four".