21053774 has 32 divisors (see below), whose sum is σ = 37632000. Its totient is φ = 8644320.

The previous prime is 21053741. The next prime is 21053783. The reversal of 21053774 is 47735012.

21053774 = 50² + 51² + ... + 398².

It is a super-2 number, since 2×21053774² = 886522799286152, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60152 + ... + 60500.

It is an arithmetic number, because the mean of its divisors is an integer number (1176000).

Almost surely, 2^21053774 is an apocalyptic number.

21053774 is a deficient number, since it is larger than the sum of its proper divisors (16578226).

21053774 is a wasteful number, since it uses less digits than its factorization.

21053774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 21053774 is about 4588.4391681704. The cubic root of 21053774 is about 276.1277064260.

Adding to 21053774 its reverse (47735012), we get a palindrome (68788786).

The spelling of 21053774 in words is "twenty-one million, fifty-three thousand, seven hundred seventy-four".