121211010212220 has 36 divisors (see below), whose sum is σ = 367673397644280. Its totient is φ = 32322936056544.

The previous prime is 121211010212219. The next prime is 121211010212287. The reversal of 121211010212220 is 22212010112121.

121211010212220 is a `hidden beast` number, since 1 + 21 + 211 + 0 + 1 + 0 + 212 + 220 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×121211010212220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121211010212193 and 121211010212202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 336697250410 + ... + 336697250769.

Almost surely, 2^{121211010212220} is an apocalyptic number.

121211010212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211010212220 is an abundant number, since it is smaller than the sum of its proper divisors (246462387432060).

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

121211010212220 is a wasteful number, since it uses less digits than its factorization.

121211010212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673394501194 (or 673394501189 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121211010212220 its reverse (22212010112121), we get a palindrome (143423020324341).

The spelling of 121211010212220 in words is "one hundred twenty-one trillion, two hundred eleven billion, ten million, two hundred twelve thousand, two hundred twenty".