1221210121010 has 16 divisors (see below), whose sum is σ = 2398012601472. Its totient is φ = 444076407600.

The previous prime is 1221210121009. The next prime is 1221210121049. The reversal of 1221210121010 is 101210121221.

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, 5550954986 + ... + 5550955205.

It is an arithmetic number, because the mean of its divisors is an integer number (149875787592).

Almost surely, 2^{1221210121010} is an apocalyptic number.

1221210121010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221210121010 is a deficient number, since it is larger than the sum of its proper divisors (1176802480462).

1221210121010 is a wasteful number, since it uses less digits than its factorization.

1221210121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11101910209.

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

Adding to 1221210121010 its reverse (101210121221), we get a palindrome (1322420242231).

The spelling of 1221210121010 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, one hundred twenty-one thousand, ten".