21120221026 has 4 divisors (see below), whose sum is σ = 31680331542. Its totient is φ = 10560110512.

The previous prime is 21120221011. The next prime is 21120221027. The reversal of 21120221026 is 62012202112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17138737225 + 3981483801 = 130915^2 + 63099^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21120220994 and 21120221012.

It is not an unprimeable number, because it can be changed into a prime (21120221027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280055255 + ... + 5280055258.

Almost surely, 2^21120221026 is an apocalyptic number.

21120221026 is a deficient number, since it is larger than the sum of its proper divisors (10560110516).

21120221026 is a wasteful number, since it uses less digits than its factorization.

21120221026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10560110515.

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

Adding to 21120221026 its reverse (62012202112), we get a palindrome (83132423138).

The spelling of 21120221026 in words is "twenty-one billion, one hundred twenty million, two hundred twenty-one thousand, twenty-six".