21051122 has 8 divisors (see below), whose sum is σ = 32346972. Its totient is φ = 10268800.

The previous prime is 21051103. The next prime is 21051137. The reversal of 21051122 is 22115012.

It can be written as a sum of positive squares in 2 ways, for example, as 15295921 + 5755201 = 3911^2 + 2399^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21051097 and 21051106.

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, 128279 + ... + 128442.

Almost surely, 2^21051122 is an apocalyptic number.

21051122 is a deficient number, since it is larger than the sum of its proper divisors (11295850).

21051122 is a wasteful number, since it uses less digits than its factorization.

21051122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256764.

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

The square root of 21051122 is about 4588.1501719102. The cubic root of 21051122 is about 276.1161119659.

Adding to 21051122 its reverse (22115012), we get a palindrome (43166134).

The spelling of 21051122 in words is "twenty-one million, fifty-one thousand, one hundred twenty-two".