21151052 has 24 divisors (see below), whose sum is σ = 41150592. Its totient is φ = 9446400.

The previous prime is 21151049. The next prime is 21151057. The reversal of 21151052 is 25015112.

It is a self number, because there is not a number n which added to its sum of digits gives 21151052.

It is not an unprimeable number, because it can be changed into a prime (21151057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4949 + ... + 8172.

It is an arithmetic number, because the mean of its divisors is an integer number (1714608).

Almost surely, 2^21151052 is an apocalyptic number.

It is an amenable number.

21151052 is a deficient number, since it is larger than the sum of its proper divisors (19999540).

21151052 is a wasteful number, since it uses less digits than its factorization.

21151052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13169 (or 13167 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 21151052 is about 4599.0272884600. The cubic root of 21151052 is about 276.5523315891.

Adding to 21151052 its reverse (25015112), we get a palindrome (46166164).

The spelling of 21151052 in words is "twenty-one million, one hundred fifty-one thousand, fifty-two".