21345754 has 4 divisors (see below), whose sum is σ = 32018634. Its totient is φ = 10672876.

The previous prime is 21345733. The next prime is 21345757. The reversal of 21345754 is 45754312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17867529 + 3478225 = 4227^2 + 1865^2 .

It is not an unprimeable number, because it can be changed into a prime (21345757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5336437 + ... + 5336440.

Almost surely, 2^21345754 is an apocalyptic number.

21345754 is a deficient number, since it is larger than the sum of its proper divisors (10672880).

21345754 is a wasteful number, since it uses less digits than its factorization.

21345754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10672879.

The product of its digits is 16800, while the sum is 31.

The square root of 21345754 is about 4620.1465344727. The cubic root of 21345754 is about 277.3983243556.

The spelling of 21345754 in words is "twenty-one million, three hundred forty-five thousand, seven hundred fifty-four".