1221706070 has 24 divisors (see below), whose sum is σ = 2381245776. Its totient is φ = 451090848.

The previous prime is 1221706043. The next prime is 1221706081. The reversal of 1221706070 is 706071221.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 359762 + ... + 363141.

It is an arithmetic number, because the mean of its divisors is an integer number (99218574).

Almost surely, 2^1221706070 is an apocalyptic number.

1221706070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221706070 is a deficient number, since it is larger than the sum of its proper divisors (1159539706).

1221706070 is a wasteful number, since it uses less digits than its factorization.

1221706070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722936 (or 722923 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 1221706070 is about 34952.9121819627. The cubic root of 1221706070 is about 1069.0275819004.

Adding to 1221706070 its reverse (706071221), we get a palindrome (1927777291).

The spelling of 1221706070 in words is "one billion, two hundred twenty-one million, seven hundred six thousand, seventy".