21055021034 has 8 divisors (see below), whose sum is σ = 31794495300. Its totient is φ = 10456855936.

The previous prime is 21055020949. The next prime is 21055021063. The reversal of 21055021034 is 43012055012.

It can be written as a sum of positive squares in 2 ways, for example, as 20924490409 + 130530625 = 144653^2 + 11425^2 .

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, 35326919 + ... + 35327514.

Almost surely, 2^21055021034 is an apocalyptic number.

21055021034 is a deficient number, since it is larger than the sum of its proper divisors (10739474266).

21055021034 is a wasteful number, since it uses less digits than its factorization.

21055021034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70654584.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 21055021034 its reverse (43012055012), we get a palindrome (64067076046).

The spelling of 21055021034 in words is "twenty-one billion, fifty-five million, twenty-one thousand, thirty-four".