1021212111220 has 96 divisors (see below), whose sum is σ = 2650294950912. Its totient is φ = 322522595328.

The previous prime is 1021212111193. The next prime is 1021212111221. The reversal of 1021212111220 is 221112121201.

It is a super-2 number, since 2×1021212111220² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1021212111194 and 1021212111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021212111221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4452829 + ... + 4676548.

It is an arithmetic number, because the mean of its divisors is an integer number (27607239072).

Almost surely, 2^{1021212111220} is an apocalyptic number.

1021212111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021212111220 is an abundant number, since it is smaller than the sum of its proper divisors (1629082839692).

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

1021212111220 is a wasteful number, since it uses less digits than its factorization.

1021212111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9129457 (or 9129455 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1021212111220 its reverse (221112121201), we get a palindrome (1242324232421).

The spelling of 1021212111220 in words is "one trillion, twenty-one billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty".