10001211000021 has 40 divisors (see below), whose sum is σ = 15847829490240. Its totient is φ = 6263797018752.

The previous prime is 10001211000019. The next prime is 10001211000107. The reversal of 10001211000021 is 12000011210001.

It is a happy number.

It is not a de Polignac number, because 10001211000021 - 2¹ = 10001211000019 is a prime.

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 = 10001210999967 and 10001211000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001211008021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5885761 + ... + 7392198.

It is an arithmetic number, because the mean of its divisors is an integer number (396195737256).

Almost surely, 2^{10001211000021} is an apocalyptic number.

It is an amenable number.

10001211000021 is a deficient number, since it is larger than the sum of its proper divisors (5846618490219).

10001211000021 is a wasteful number, since it uses less digits than its factorization.

10001211000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13278535 (or 13278526 counting only the distinct ones).

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

Adding to 10001211000021 its reverse (12000011210001), we get a palindrome (22001222210022).

The spelling of 10001211000021 in words is "ten trillion, one billion, two hundred eleven million, twenty-one", and thus it is an aban number.