1221210111010 has 8 divisors (see below), whose sum is σ = 2198178199836. Its totient is φ = 488484044400.

The previous prime is 1221210110993. The next prime is 1221210111031. The reversal of 1221210111010 is 101110121221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1207324081089 + 13886029921 = 1098783^2 + 117839^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61060505541 + ... + 61060505560.

Almost surely, 2^{1221210111010} is an apocalyptic number.

1221210111010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221210111010 is a deficient number, since it is larger than the sum of its proper divisors (976968088826).

1221210111010 is a wasteful number, since it uses less digits than its factorization.

1221210111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122121011108.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1221210111010 its reverse (101110121221), we get a palindrome (1322320232231).

The spelling of 1221210111010 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, one hundred eleven thousand, ten".