121211121121210 has 16 divisors (see below), whose sum is σ = 229663176861600. Its totient is φ = 45932635372176.

The previous prime is 121211121121157. The next prime is 121211121121247. The reversal of 121211121121210 is 12121121112121.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318976634340 + ... + 318976634719.

It is an arithmetic number, because the mean of its divisors is an integer number (14353948553850).

Almost surely, 2^{121211121121210} is an apocalyptic number.

121211121121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121211121121210 is a deficient number, since it is larger than the sum of its proper divisors (108452055740390).

121211121121210 is a wasteful number, since it uses less digits than its factorization.

121211121121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637953269085.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 121211121121210 its reverse (12121121112121), we get a palindrome (133332242233331).

The spelling of 121211121121210 in words is "one hundred twenty-one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred ten".