21121151410 has 32 divisors (see below), whose sum is σ = 39059674992. Its totient is φ = 8217158400.

The previous prime is 21121151383. The next prime is 21121151461. The reversal of 21121151410 is 1415112112.

It can be written as a sum of positive squares in 8 ways, for example, as 4765555089 + 16355596321 = 69033^2 + 127889^2 .

It is a super-2 number, since 2×21121151410² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1212724 + ... + 1230016.

Almost surely, 2^21121151410 is an apocalyptic number.

21121151410 is a deficient number, since it is larger than the sum of its proper divisors (17938523582).

21121151410 is a wasteful number, since it uses less digits than its factorization.

21121151410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20638.

The product of its (nonzero) digits is 80, while the sum is 19.

Adding to 21121151410 its reverse (1415112112), we get a palindrome (22536263522).

The spelling of 21121151410 in words is "twenty-one billion, one hundred twenty-one million, one hundred fifty-one thousand, four hundred ten".