1202121000021 has 8 divisors (see below), whose sum is σ = 1603500618880. Its totient is φ = 801077690592.

The previous prime is 1202121000013. The next prime is 1202121000029. The reversal of 1202121000021 is 1200001212021.

It is an interprime number because it is at equal distance from previous prime (1202121000013) and next prime (1202121000029).

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

It is not a de Polignac number, because 1202121000021 - 2³ = 1202121000013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1202120999970 and 1202121000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202121000029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84069016 + ... + 84083313.

It is an arithmetic number, because the mean of its divisors is an integer number (200437577360).

Almost surely, 2^{1202121000021} is an apocalyptic number.

It is an amenable number.

1202121000021 is a deficient number, since it is larger than the sum of its proper divisors (401379618859).

1202121000021 is a wasteful number, since it uses less digits than its factorization.

1202121000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168154715.

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

Adding to 1202121000021 its reverse (1200001212021), we get a palindrome (2402122212042).

The spelling of 1202121000021 in words is "one trillion, two hundred two billion, one hundred twenty-one million, twenty-one", and thus it is an aban number.