21054364 has 12 divisors (see below), whose sum is σ = 39012624. Its totient is φ = 9907904.

The previous prime is 21054353. The next prime is 21054373. The reversal of 21054364 is 46345012.

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, 154744 + ... + 154879.

It is an arithmetic number, because the mean of its divisors is an integer number (3251052).

Almost surely, 2^21054364 is an apocalyptic number.

It is an amenable number.

21054364 is a deficient number, since it is larger than the sum of its proper divisors (17958260).

21054364 is a wasteful number, since it uses less digits than its factorization.

21054364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309644 (or 309642 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 21054364 is about 4588.5034597350. The cubic root of 21054364 is about 276.1302857549.

Adding to 21054364 its reverse (46345012), we get a palindrome (67399376).

The spelling of 21054364 in words is "twenty-one million, fifty-four thousand, three hundred sixty-four".