1211221012010 has 32 divisors (see below), whose sum is σ = 2226727037952. Its totient is φ = 474149894400.

The previous prime is 1211221012009. The next prime is 1211221012039. The reversal of 1211221012010 is 102101221121.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8175554 + ... + 8322386.

It is an arithmetic number, because the mean of its divisors is an integer number (69585219936).

Almost surely, 2^{1211221012010} is an apocalyptic number.

1211221012010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211221012010 is a deficient number, since it is larger than the sum of its proper divisors (1015506025942).

1211221012010 is a wasteful number, since it uses less digits than its factorization.

1211221012010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164438.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211221012010 its reverse (102101221121), we get a palindrome (1313322233131).

The spelling of 1211221012010 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, twelve thousand, ten".