1221736026 has 32 divisors (see below), whose sum is σ = 2794958208. Its totient is φ = 348765120.

The previous prime is 1221736007. The next prime is 1221736073. The reversal of 1221736026 is 6206371221.

It is a junction number, because it is equal to n+sod(n) for n = 1221735984 and 1221736002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38956 + ... + 62936.

It is an arithmetic number, because the mean of its divisors is an integer number (87342444).

Almost surely, 2^1221736026 is an apocalyptic number.

1221736026 is an abundant number, since it is smaller than the sum of its proper divisors (1573222182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221736026 is a wasteful number, since it uses less digits than its factorization.

1221736026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25206.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 1221736026 is about 34953.3406987086. The cubic root of 1221736026 is about 1069.0363192798.

The spelling of 1221736026 in words is "one billion, two hundred twenty-one million, seven hundred thirty-six thousand, twenty-six".