1221121011010 has 16 divisors (see below), whose sum is σ = 2293583812416. Its totient is φ = 467211517168.

The previous prime is 1221121010981. The next prime is 1221121011049. The reversal of 1221121011010 is 101101211221.

It is a happy number.

It is a super-2 number, since 2×1221121011010² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2654610664 + ... + 2654611123.

It is an arithmetic number, because the mean of its divisors is an integer number (143348988276).

Almost surely, 2^{1221121011010} is an apocalyptic number.

1221121011010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221121011010 is a deficient number, since it is larger than the sum of its proper divisors (1072462801406).

1221121011010 is a wasteful number, since it uses less digits than its factorization.

1221121011010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5309221817.

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

Adding to 1221121011010 its reverse (101101211221), we get a palindrome (1322222222231).

The spelling of 1221121011010 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, eleven thousand, ten".