21021103450 has 24 divisors (see below), whose sum is σ = 39247943328. Its totient is φ = 8376464880.

The previous prime is 21021103421. The next prime is 21021103463. The reversal of 21021103450 is 5430112012.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 786132 + ... + 812431.

It is an arithmetic number, because the mean of its divisors is an integer number (1635330972).

Almost surely, 2^21021103450 is an apocalyptic number.

21021103450 is a deficient number, since it is larger than the sum of its proper divisors (18226839878).

21021103450 is a wasteful number, since it uses less digits than its factorization.

21021103450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1598838 (or 1598833 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21021103450 its reverse (5430112012), we get a palindrome (26451215462).

The spelling of 21021103450 in words is "twenty-one billion, twenty-one million, one hundred three thousand, four hundred fifty".