121620506 has 16 divisors (see below), whose sum is σ = 209178816. Its totient is φ = 51951456.

The previous prime is 121620503. The next prime is 121620509. The reversal of 121620506 is 605026121.

It is an interprime number because it is at equal distance from previous prime (121620503) and next prime (121620509).

It is not an unprimeable number, because it can be changed into a prime (121620503) 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, 9851 + ... + 18446.

It is an arithmetic number, because the mean of its divisors is an integer number (13073676).

Almost surely, 2^121620506 is an apocalyptic number.

121620506 is a deficient number, since it is larger than the sum of its proper divisors (87558310).

121620506 is a wasteful number, since it uses less digits than its factorization.

121620506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28613.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 121620506 is about 11028.1687509758. The cubic root of 121620506 is about 495.4527789262.

Adding to 121620506 its reverse (605026121), we get a palindrome (726646627).

The spelling of 121620506 in words is "one hundred twenty-one million, six hundred twenty thousand, five hundred six".