21102034 has 4 divisors (see below), whose sum is σ = 31653054. Its totient is φ = 10551016.

The previous prime is 21102023. The next prime is 21102047. The reversal of 21102034 is 43020112.

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., 19669225 + 1432809 = 4435^2 + 1197^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275507 + ... + 5275510.

Almost surely, 2^21102034 is an apocalyptic number.

21102034 is a deficient number, since it is larger than the sum of its proper divisors (10551020).

21102034 is a wasteful number, since it uses less digits than its factorization.

21102034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10551019.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21102034 is about 4593.6950268820. The cubic root of 21102034 is about 276.3385277583.

Adding to 21102034 its reverse (43020112), we get a palindrome (64122146).

The spelling of 21102034 in words is "twenty-one million, one hundred two thousand, thirty-four".