21001120034 has 16 divisors (see below), whose sum is σ = 33660732600. Its totient is φ = 9792209664.

The previous prime is 21001120013. The next prime is 21001120073. The reversal of 21001120034 is 43002110012.

It can be written as a sum of positive squares in 4 ways, for example, as 20754724225 + 246395809 = 144065^2 + 15697^2 .

It is a super-2 number, since 2×21001120034² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2829689 + ... + 2837100.

Almost surely, 2^21001120034 is an apocalyptic number.

21001120034 is a deficient number, since it is larger than the sum of its proper divisors (12659612566).

21001120034 is a wasteful number, since it uses less digits than its factorization.

21001120034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5666917.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21001120034 its reverse (43002110012), we get a palindrome (64003230046).

The spelling of 21001120034 in words is "twenty-one billion, one million, one hundred twenty thousand, thirty-four".