1211212120010 has 24 divisors (see below), whose sum is σ = 2252778939108. Its totient is φ = 468856300800.

The previous prime is 1211212119961. The next prime is 1211212120021. The reversal of 1211212120010 is 100212121121.

It can be written as a sum of positive squares in 2 ways, for example, as 1122775471321 + 88436648689 = 1059611^2 + 297383^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63008711 + ... + 63027930.

Almost surely, 2^{1211212120010} is an apocalyptic number.

1211212120010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211212120010 is a deficient number, since it is larger than the sum of its proper divisors (1041566819098).

1211212120010 is a wasteful number, since it uses less digits than its factorization.

1211212120010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126036710 (or 126036679 counting only the distinct ones).

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

Adding to 1211212120010 its reverse (100212121121), we get a palindrome (1311424241131).

The spelling of 1211212120010 in words is "one trillion, two hundred eleven billion, two hundred twelve million, one hundred twenty thousand, ten".