21054386 has 16 divisors (see below), whose sum is σ = 32421600. Its totient is φ = 10250688.

The previous prime is 21054379. The next prime is 21054401. The reversal of 21054386 is 68345012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12545 + ... + 14123.

It is an arithmetic number, because the mean of its divisors is an integer number (2026350).

Almost surely, 2^21054386 is an apocalyptic number.

21054386 is a deficient number, since it is larger than the sum of its proper divisors (11367214).

21054386 is a wasteful number, since it uses less digits than its factorization.

21054386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21054386 is about 4588.5058570302. The cubic root of 21054386 is about 276.1303819324.

Adding to 21054386 its reverse (68345012), we get a palindrome (89399398).

The spelling of 21054386 in words is "twenty-one million, fifty-four thousand, three hundred eighty-six".