1226217021 has 16 divisors (see below), whose sum is σ = 1731991104. Its totient is φ = 769008384.

The previous prime is 1226217007. The next prime is 1226217023. The reversal of 1226217021 is 1207126221.

It is not a de Polignac number, because 1226217021 - 2¹¹ = 1226214973 is a prime.

It is a super-2 number, since 2×1226217021² = 3007216365180228882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1226216982 and 1226217000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226217023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125706 + ... + 135108.

It is an arithmetic number, because the mean of its divisors is an integer number (108249444).

Almost surely, 2^1226217021 is an apocalyptic number.

It is an amenable number.

1226217021 is a deficient number, since it is larger than the sum of its proper divisors (505774083).

1226217021 is a wasteful number, since it uses less digits than its factorization.

1226217021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11980.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 1226217021 is about 35017.3816982367. The cubic root of 1226217021 is about 1070.3417026693.

The spelling of 1226217021 in words is "one billion, two hundred twenty-six million, two hundred seventeen thousand, twenty-one".