21890538670226 has 8 divisors (see below), whose sum is σ = 32838480009660. Its totient is φ = 10944378667008.

The previous prime is 21890538670223. The next prime is 21890538670267. The reversal of 21890538670226 is 62207683509812.

It can be written as a sum of positive squares in 2 ways, for example, as 21830807799025 + 59730871201 = 4672345^2 + 244399^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21890538670223) 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, 445303331 + ... + 445352486.

Almost surely, 2^{21890538670226} is an apocalyptic number.

21890538670226 is a deficient number, since it is larger than the sum of its proper divisors (10947941339434).

21890538670226 is a wasteful number, since it uses less digits than its factorization.

21890538670226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890668108.

The product of its (nonzero) digits is 17418240, while the sum is 59.

The spelling of 21890538670226 in words is "twenty-one trillion, eight hundred ninety billion, five hundred thirty-eight million, six hundred seventy thousand, two hundred twenty-six".