1221001011010 has 64 divisors (see below), whose sum is σ = 2439199474560. Its totient is φ = 436303060480.

The previous prime is 1221001010969. The next prime is 1221001011023. The reversal of 1221001011010 is 101101001221.

It is a Harshad number since it is a multiple of its sum of digits (10).

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 31 ways as a sum of consecutive naturals, for example, 17052444 + ... + 17123896.

It is an arithmetic number, because the mean of its divisors is an integer number (38112491790).

Almost surely, 2^{1221001011010} is an apocalyptic number.

1221001011010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221001011010 is a deficient number, since it is larger than the sum of its proper divisors (1218198463550).

1221001011010 is a wasteful number, since it uses less digits than its factorization.

1221001011010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74163.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1221001011010 its reverse (101101001221), we get a palindrome (1322102012231).

The spelling of 1221001011010 in words is "one trillion, two hundred twenty-one billion, one million, eleven thousand, ten".