21221210410 has 8 divisors (see below), whose sum is σ = 38198178756. Its totient is φ = 8488484160.

The previous prime is 21221210369. The next prime is 21221210453. The reversal of 21221210410 is 1401212212.

It can be written as a sum of positive squares in 2 ways, for example, as 18759959089 + 2461251321 = 136967^2 + 49611^2 .

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

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, 1061060511 + ... + 1061060530.

Almost surely, 2^21221210410 is an apocalyptic number.

21221210410 is a deficient number, since it is larger than the sum of its proper divisors (16976968346).

21221210410 is a wasteful number, since it uses less digits than its factorization.

21221210410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122121048.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221210410 its reverse (1401212212), we get a palindrome (22622422622).

The spelling of 21221210410 in words is "twenty-one billion, two hundred twenty-one million, two hundred ten thousand, four hundred ten".