1221220021010 has 32 divisors (see below), whose sum is σ = 2398229301312. Its totient is φ = 444043478080.

The previous prime is 1221220020953. The next prime is 1221220021067. The reversal of 1221220021010 is 101200221221.

It is an interprime number because it is at equal distance from previous prime (1221220020953) and next prime (1221220021067).

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, 905072 + ... + 1805988.

It is an arithmetic number, because the mean of its divisors is an integer number (74944665666).

Almost surely, 2^{1221220021010} is an apocalyptic number.

1221220021010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221220021010 is a deficient number, since it is larger than the sum of its proper divisors (1177009280302).

1221220021010 is a wasteful number, since it uses less digits than its factorization.

1221220021010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913258.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221220021010 its reverse (101200221221), we get a palindrome (1322420242231).

The spelling of 1221220021010 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, twenty-one thousand, ten".