21221550126226 has 64 divisors (see below), whose sum is σ = 33983488465920. Its totient is φ = 9910117990080.

The previous prime is 21221550126223. The next prime is 21221550126347. The reversal of 21221550126226 is 62262105512212.

It is not an unprimeable number, because it can be changed into a prime (21221550126223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3836835081 + ... + 3836840611.

It is an arithmetic number, because the mean of its divisors is an integer number (530992007280).

Almost surely, 2^{21221550126226} is an apocalyptic number.

21221550126226 is a deficient number, since it is larger than the sum of its proper divisors (12761938339694).

21221550126226 is a wasteful number, since it uses less digits than its factorization.

21221550126226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7999.

The product of its (nonzero) digits is 57600, while the sum is 37.

Adding to 21221550126226 its reverse (62262105512212), we get a palindrome (83483655638438).

The spelling of 21221550126226 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred fifty million, one hundred twenty-six thousand, two hundred twenty-six".