121213003220 has 24 divisors (see below), whose sum is σ = 269520678504. Its totient is φ = 45633130496.

The previous prime is 121213003159. The next prime is 121213003229. The reversal of 121213003220 is 22300312121.

It can be written as a sum of positive squares in 4 ways, for example, as 9231750724 + 111981252496 = 96082^2 + 334636^2 .

It is a super-2 number, since 2×121213003220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121213003229) 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, 178254077 + ... + 178254756.

It is an arithmetic number, because the mean of its divisors is an integer number (11230028271).

Almost surely, 2^121213003220 is an apocalyptic number.

121213003220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121213003220 is an abundant number, since it is smaller than the sum of its proper divisors (148307675284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121213003220 is a wasteful number, since it uses less digits than its factorization.

121213003220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356508859 (or 356508857 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 121213003220 its reverse (22300312121), we get a palindrome (143513315341).

The spelling of 121213003220 in words is "one hundred twenty-one billion, two hundred thirteen million, three thousand, two hundred twenty".