121221101210 has 16 divisors (see below), whose sum is σ = 238034162592. Its totient is φ = 44080400400.

The previous prime is 121221101207. The next prime is 121221101213. The reversal of 121221101210 is 12101122121.

It is an interprime number because it is at equal distance from previous prime (121221101207) and next prime (121221101213).

It is not an unprimeable number, because it can be changed into a prime (121221101213) 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, 551004896 + ... + 551005115.

It is an arithmetic number, because the mean of its divisors is an integer number (14877135162).

Almost surely, 2^121221101210 is an apocalyptic number.

121221101210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221101210 is a deficient number, since it is larger than the sum of its proper divisors (116813061382).

121221101210 is a wasteful number, since it uses less digits than its factorization.

121221101210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102010029.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121221101210 its reverse (12101122121), we get a palindrome (133322223331).

The spelling of 121221101210 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, two hundred ten".