1221211010010 has 256 divisors, whose sum is σ = 3147385393152. Its totient is φ = 302565120000.

The previous prime is 1221211009981. The next prime is 1221211010023. The reversal of 1221211010010 is 100101121221.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2138723025 + ... + 2138723595.

It is an arithmetic number, because the mean of its divisors is an integer number (12294474192).

Almost surely, 2^{1221211010010} is an apocalyptic number.

1221211010010 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 1221211010010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1573692696576).

1221211010010 is an abundant number, since it is smaller than the sum of its proper divisors (1926174383142).

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

1221211010010 is a wasteful number, since it uses less digits than its factorization.

1221211010010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141.

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

Adding to 1221211010010 its reverse (100101121221), we get a palindrome (1321312131231).

The spelling of 1221211010010 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, ten thousand, ten".