1021211000220 has 96 divisors (see below), whose sum is σ = 3010504654080. Its totient is φ = 257937039360.

The previous prime is 1021211000213. The next prime is 1021211000237. The reversal of 1021211000220 is 220001121201.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1021211000196 and 1021211000205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5602315 + ... + 5781725.

It is an arithmetic number, because the mean of its divisors is an integer number (31359423480).

Almost surely, 2^{1021211000220} is an apocalyptic number.

1021211000220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021211000220 is an abundant number, since it is smaller than the sum of its proper divisors (1989293653860).

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

1021211000220 is a wasteful number, since it uses less digits than its factorization.

1021211000220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184435 (or 184433 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1021211000220 its reverse (220001121201), we get a palindrome (1241212121421).

The spelling of 1021211000220 in words is "one trillion, twenty-one billion, two hundred eleven million, two hundred twenty", and thus it is an aban number.