21472506226 has 4 divisors (see below), whose sum is σ = 32208759342. Its totient is φ = 10736253112.

The previous prime is 21472506203. The next prime is 21472506229. The reversal of 21472506226 is 62260527412.

It is a Cunningham number, because it is equal to 146535²+1.

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., 21472506225 + 1 = 146535^2 + 1^2 .

It is a super-2 number, since 2×21472506226² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21472506229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5368126555 + ... + 5368126558.

Almost surely, 2^21472506226 is an apocalyptic number.

21472506226 is a deficient number, since it is larger than the sum of its proper divisors (10736253116).

21472506226 is a wasteful number, since it uses less digits than its factorization.

21472506226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10736253115.

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 21472506226 in words is "twenty-one billion, four hundred seventy-two million, five hundred six thousand, two hundred twenty-six".