1211202000021 has 16 divisors (see below), whose sum is σ = 1739282690880. Its totient is φ = 745303286400.

The previous prime is 1211202000011. The next prime is 1211202000031. The reversal of 1211202000021 is 1200002021121.

It is an interprime number because it is at equal distance from previous prime (1211202000011) and next prime (1211202000031).

It is not a de Polignac number, because 1211202000021 - 2⁹ = 1211201999509 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1211201999970 and 1211202000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211202000011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 506655 + ... + 1636796.

It is an arithmetic number, because the mean of its divisors is an integer number (108705168180).

Almost surely, 2^{1211202000021} is an apocalyptic number.

It is an amenable number.

1211202000021 is a deficient number, since it is larger than the sum of its proper divisors (528080690859).

1211202000021 is a wasteful number, since it uses less digits than its factorization.

1211202000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157956.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1211202000021 its reverse (1200002021121), we get a palindrome (2411204021142).

The spelling of 1211202000021 in words is "one trillion, two hundred eleven billion, two hundred two million, twenty-one", and thus it is an aban number.