1202000001021 has 48 divisors (see below), whose sum is σ = 1859408628480. Its totient is φ = 745561512960.

The previous prime is 1202000001017. The next prime is 1202000001023. The reversal of 1202000001021 is 1201000002021.

It is not a de Polignac number, because 1202000001021 - 2² = 1202000001017 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 = 1202000000994 and 1202000001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202000001023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110442046 + ... + 110452928.

It is an arithmetic number, because the mean of its divisors is an integer number (38737679760).

Almost surely, 2^{1202000001021} is an apocalyptic number.

It is an amenable number.

1202000001021 is a deficient number, since it is larger than the sum of its proper divisors (657408627459).

1202000001021 is a wasteful number, since it uses less digits than its factorization.

1202000001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19106 (or 19103 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1202000001021 its reverse (1201000002021), we get a palindrome (2403000003042).

The spelling of 1202000001021 in words is "one trillion, two hundred two billion, one thousand, twenty-one".