1021211101220 has 24 divisors (see below), whose sum is σ = 2158936227000. Its totient is φ = 405742932992.

The previous prime is 1021211101217. The next prime is 1021211101271. The reversal of 1021211101220 is 221011121201.

It can be written as a sum of positive squares in 4 ways, for example, as 3097812964 + 1018113288256 = 55658^2 + 1009016^2 .

It is a super-2 number, since 2×1021211101220² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1021211101195 and 1021211101204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171341165 + ... + 171347124.

It is an arithmetic number, because the mean of its divisors is an integer number (89955676125).

Almost surely, 2^{1021211101220} is an apocalyptic number.

1021211101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021211101220 is an abundant number, since it is smaller than the sum of its proper divisors (1137725125780).

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

1021211101220 is a wasteful number, since it uses less digits than its factorization.

1021211101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342688447 (or 342688445 counting only the distinct ones).

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

Adding to 1021211101220 its reverse (221011121201), we get a palindrome (1242222222421).

The spelling of 1021211101220 in words is "one trillion, twenty-one billion, two hundred eleven million, one hundred one thousand, two hundred twenty".