21070054 has 4 divisors (see below), whose sum is σ = 31605084. Its totient is φ = 10535026.

The previous prime is 21070033. The next prime is 21070073. The reversal of 21070054 is 45007012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5267512 + ... + 5267515.

It is an arithmetic number, because the mean of its divisors is an integer number (7901271).

Almost surely, 2^21070054 is an apocalyptic number.

21070054 is a deficient number, since it is larger than the sum of its proper divisors (10535030).

21070054 is a wasteful number, since it uses less digits than its factorization.

21070054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10535029.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 21070054 is about 4590.2128490953. The cubic root of 21070054 is about 276.1988607452.

Adding to 21070054 its reverse (45007012), we get a palindrome (66077066).

The spelling of 21070054 in words is "twenty-one million, seventy thousand, fifty-four".