21034121410 has 16 divisors (see below), whose sum is σ = 37876973112. Its totient is φ = 8410192000.

The previous prime is 21034121389. The next prime is 21034121417. The reversal of 21034121410 is 1412143012.

It can be written as a sum of positive squares in 4 ways, for example, as 18203136561 + 2830984849 = 134919^2 + 53207^2 .

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21034121417) 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, 406441 + ... + 455260.

Almost surely, 2^21034121410 is an apocalyptic number.

21034121410 is a deficient number, since it is larger than the sum of its proper divisors (16842851702).

21034121410 is a wasteful number, since it uses less digits than its factorization.

21034121410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864149.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21034121410 its reverse (1412143012), we get a palindrome (22446264422).

The spelling of 21034121410 in words is "twenty-one billion, thirty-four million, one hundred twenty-one thousand, four hundred ten".