1211021000010 has 64 divisors (see below), whose sum is σ = 3304491442560. Its totient is φ = 315428722560.

The previous prime is 1211020999961. The next prime is 1211021000029. The reversal of 1211021000010 is 100001201121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1211020999956 and 1211021000001.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52142611 + ... + 52165830.

It is an arithmetic number, because the mean of its divisors is an integer number (51632678790).

Almost surely, 2^{1211021000010} is an apocalyptic number.

1211021000010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211021000010 is an abundant number, since it is smaller than the sum of its proper divisors (2093470442550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211021000010 is a wasteful number, since it uses less digits than its factorization.

1211021000010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104308500 (or 104308494 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1211021000010 its reverse (100001201121), we get a palindrome (1311022201131).

The spelling of 1211021000010 in words is "one trillion, two hundred eleven billion, twenty-one million, ten", and thus it is an aban number.