1221002010010 has 8 divisors (see below), whose sum is σ = 2197803618036. Its totient is φ = 488400804000.

The previous prime is 1221002010001. The next prime is 1221002010013. The reversal of 1221002010010 is 100102001221.

It can be written as a sum of positive squares in 2 ways, for example, as 1157704985089 + 63297024921 = 1075967^2 + 251589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 122100201001 = 1221002010010 / (1 + 2 + 2 + 1 + 0 + 0 + 2 + 0 + 1 + 0 + 0 + 1 + 0).

It is not an unprimeable number, because it can be changed into a prime (1221002010013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61050100491 + ... + 61050100510.

Almost surely, 2^{1221002010010} is an apocalyptic number.

1221002010010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221002010010 is a deficient number, since it is larger than the sum of its proper divisors (976801608026).

1221002010010 is a wasteful number, since it uses less digits than its factorization.

1221002010010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122100201008.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1221002010010 its reverse (100102001221), we get a palindrome (1321104011231).

The spelling of 1221002010010 in words is "one trillion, two hundred twenty-one billion, two million, ten thousand, ten".