121217151 has 16 divisors (see below), whose sum is σ = 176520960. Its totient is φ = 73379520.

The previous prime is 121217149. The next prime is 121217219. The reversal of 121217151 is 151712121.

It is not a de Polignac number, because 121217151 - 2¹ = 121217149 is a prime.

It is a super-3 number, since 3×121217151³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121217111) 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, 37830 + ... + 40908.

It is an arithmetic number, because the mean of its divisors is an integer number (11032560).

Almost surely, 2^121217151 is an apocalyptic number.

121217151 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121217151 is a deficient number, since it is larger than the sum of its proper divisors (55303809).

121217151 is a wasteful number, since it uses less digits than its factorization.

121217151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4286.

The product of its digits is 140, while the sum is 21.

The square root of 121217151 is about 11009.8660754798. The cubic root of 121217151 is about 494.9044484477.

Adding to 121217151 its reverse (151712121), we get a palindrome (272929272).

The spelling of 121217151 in words is "one hundred twenty-one million, two hundred seventeen thousand, one hundred fifty-one".