121210545 has 16 divisors (see below), whose sum is σ = 194530752. Its totient is φ = 64447680.

The previous prime is 121210511. The next prime is 121210553. The reversal of 121210545 is 545012121.

It is not a de Polignac number, because 121210545 - 2¹¹ = 121208497 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7242 + ... + 17171.

It is an arithmetic number, because the mean of its divisors is an integer number (12158172).

Almost surely, 2^121210545 is an apocalyptic number.

121210545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121210545 is a deficient number, since it is larger than the sum of its proper divisors (73320207).

121210545 is a wasteful number, since it uses less digits than its factorization.

121210545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24752.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 121210545 is about 11009.5660677431. The cubic root of 121210545 is about 494.8954579758.

Adding to 121210545 its reverse (545012121), we get a palindrome (666222666).

The spelling of 121210545 in words is "one hundred twenty-one million, two hundred ten thousand, five hundred forty-five".