1221122120210 has 8 divisors (see below), whose sum is σ = 2198019816396. Its totient is φ = 488448848080.

The previous prime is 1221122120209. The next prime is 1221122120219. The reversal of 1221122120210 is 120212211221.

It can be written as a sum of positive squares in 2 ways, for example, as 1146075161401 + 75046958809 = 1070549^2 + 273947^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1221122120210² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221122120219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61056106001 + ... + 61056106020.

Almost surely, 2^{1221122120210} is an apocalyptic number.

1221122120210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221122120210 is a deficient number, since it is larger than the sum of its proper divisors (976897696186).

1221122120210 is a wasteful number, since it uses less digits than its factorization.

1221122120210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122112212028.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221122120210 its reverse (120212211221), we get a palindrome (1341334331431).

The spelling of 1221122120210 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, two hundred ten".