21141057 has 32 divisors (see below), whose sum is σ = 33269760. Its totient is φ = 11692800.

The previous prime is 21141041. The next prime is 21141061. The reversal of 21141057 is 75014112.

It is a happy number.

It is not a de Polignac number, because 21141057 - 2⁴ = 21141041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21141007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139932 + ... + 140082.

It is an arithmetic number, because the mean of its divisors is an integer number (1039680).

Almost surely, 2^21141057 is an apocalyptic number.

It is an amenable number.

21141057 is a deficient number, since it is larger than the sum of its proper divisors (12128703).

21141057 is a wasteful number, since it uses less digits than its factorization.

21141057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 21141057 is about 4597.9405172316. The cubic root of 21141057 is about 276.5087628173.

Adding to 21141057 its reverse (75014112), we get a palindrome (96155169).

It can be divided in two parts, 2114105 and 7, that added together give a palindrome (2114112).

The spelling of 21141057 in words is "twenty-one million, one hundred forty-one thousand, fifty-seven".