21511054 has 8 divisors (see below), whose sum is σ = 32953248. Its totient is φ = 10526640.

The previous prime is 21511031. The next prime is 21511079. The reversal of 21511054 is 45011512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114327 + ... + 114514.

It is an arithmetic number, because the mean of its divisors is an integer number (4119156).

Almost surely, 2^21511054 is an apocalyptic number.

21511054 is a deficient number, since it is larger than the sum of its proper divisors (11442194).

21511054 is a wasteful number, since it uses less digits than its factorization.

21511054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228890.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 21511054 is about 4638.0010780508. The cubic root of 21511054 is about 278.1125348788.

Adding to 21511054 its reverse (45011512), we get a palindrome (66522566).

The spelling of 21511054 in words is "twenty-one million, five hundred eleven thousand, fifty-four".