21011054 has 4 divisors (see below), whose sum is σ = 31516584. Its totient is φ = 10505526.

The previous prime is 21011033. The next prime is 21011063. The reversal of 21011054 is 45011012.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252762 + ... + 5252765.

It is an arithmetic number, because the mean of its divisors is an integer number (7879146).

Almost surely, 2^21011054 is an apocalyptic number.

21011054 is a deficient number, since it is larger than the sum of its proper divisors (10505530).

21011054 is a wasteful number, since it uses less digits than its factorization.

21011054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10505529.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 21011054 is about 4583.7816265612. The cubic root of 21011054 is about 275.9408173181.

Adding to 21011054 its reverse (45011012), we get a palindrome (66022066).

The spelling of 21011054 in words is "twenty-one million, eleven thousand, fifty-four".