1021221101010 has 192 divisors, whose sum is σ = 2724411376512. Its totient is φ = 244780800000.

The previous prime is 1021221101003. The next prime is 1021221101203. The reversal of 1021221101010 is 101011221201.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 358196085 + ... + 358198935.

It is an arithmetic number, because the mean of its divisors is an integer number (14189642586).

Almost surely, 2^{1021221101010} is an apocalyptic number.

1021221101010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021221101010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1362205688256).

1021221101010 is an abundant number, since it is smaller than the sum of its proper divisors (1703190275502).

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

1021221101010 is a wasteful number, since it uses less digits than its factorization.

1021221101010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3961 (or 3950 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1021221101010 its reverse (101011221201), we get a palindrome (1122232322211).

The spelling of 1021221101010 in words is "one trillion, twenty-one billion, two hundred twenty-one million, one hundred one thousand, ten".