121245621 has 16 divisors (see below), whose sum is σ = 186000000. Its totient is φ = 68816448.

The previous prime is 121245589. The next prime is 121245623. The reversal of 121245621 is 126542121.

It is not a de Polignac number, because 121245621 - 2⁵ = 121245589 is a prime.

It is a super-2 number, since 2×121245621² = 29401001223351282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121245591 and 121245600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121245623) 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, 16246 + ... + 22503.

It is an arithmetic number, because the mean of its divisors is an integer number (11625000).

Almost surely, 2^121245621 is an apocalyptic number.

It is an amenable number.

121245621 is a deficient number, since it is larger than the sum of its proper divisors (64754379).

121245621 is a wasteful number, since it uses less digits than its factorization.

121245621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38908.

The product of its digits is 960, while the sum is 24.

The square root of 121245621 is about 11011.1589308301. The cubic root of 121245621 is about 494.9431911134.

Adding to 121245621 its reverse (126542121), we get a palindrome (247787742).

The spelling of 121245621 in words is "one hundred twenty-one million, two hundred forty-five thousand, six hundred twenty-one".