21161430226 has 8 divisors (see below), whose sum is σ = 31815794304. Its totient is φ = 10556165460.

The previous prime is 21161430203. The next prime is 21161430229. The reversal of 21161430226 is 62203416112.

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

It is a super-2 number, since 2×21161430226² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21161430194 and 21161430203.

It is not an unprimeable number, because it can be changed into a prime (21161430229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12273750 + ... + 12275473.

It is an arithmetic number, because the mean of its divisors is an integer number (3976974288).

Almost surely, 2^21161430226 is an apocalyptic number.

21161430226 is a deficient number, since it is larger than the sum of its proper divisors (10654364078).

21161430226 is a wasteful number, since it uses less digits than its factorization.

21161430226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24549656.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 21161430226 its reverse (62203416112), we get a palindrome (83364846338).

The spelling of 21161430226 in words is "twenty-one billion, one hundred sixty-one million, four hundred thirty thousand, two hundred twenty-six".