1221070 has 16 divisors (see below), whose sum is σ = 2293920. Its totient is φ = 467104.

The previous prime is 1221061. The next prime is 1221079. The reversal of 1221070 is 701221.

It is an interprime number because it is at equal distance from previous prime (1221061) and next prime (1221079).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221070.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2425 + ... + 2884.

It is an arithmetic number, because the mean of its divisors is an integer number (143370).

2^1221070 is an apocalyptic number.

1221070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221070 is a deficient number, since it is larger than the sum of its proper divisors (1072850).

1221070 is a wasteful number, since it uses less digits than its factorization.

1221070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5339.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 1221070 is about 1105.0203618033. The cubic root of 1221070 is about 106.8842023243.

Adding to 1221070 its reverse (701221), we get a palindrome (1922291).

The spelling of 1221070 in words is "one million, two hundred twenty-one thousand, seventy".