21350834 has 4 divisors (see below), whose sum is σ = 32026254. Its totient is φ = 10675416.

The previous prime is 21350809. The next prime is 21350839. The reversal of 21350834 is 43805312.

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., 19775809 + 1575025 = 4447^2 + 1255^2 .

It is a super-2 number, since 2×21350834² = 911716224991112, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21350839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5337707 + ... + 5337710.

Almost surely, 2^21350834 is an apocalyptic number.

21350834 is a deficient number, since it is larger than the sum of its proper divisors (10675420).

21350834 is a wasteful number, since it uses less digits than its factorization.

21350834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10675419.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 21350834 is about 4620.6962678800. The cubic root of 21350834 is about 277.4203282900.

The spelling of 21350834 in words is "twenty-one million, three hundred fifty thousand, eight hundred thirty-four".