1202102021 has 2 divisors, whose sum is σ = 1202102022. Its totient is φ = 1202102020.

The previous prime is 1202101987. The next prime is 1202102029. The reversal of 1202102021 is 1202012021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 615784225 + 586317796 = 24815^2 + 24214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1202102021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1202101993 and 1202102011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1202102029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601051010 + 601051011.

It is an arithmetic number, because the mean of its divisors is an integer number (601051011).

Almost surely, 2^1202102021 is an apocalyptic number.

It is an amenable number.

1202102021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1202102021 is an equidigital number, since it uses as much as digits as its factorization.

1202102021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1202102021 is about 34671.3429362060. The cubic root of 1202102021 is about 1063.2786879694.

Adding to 1202102021 its reverse (1202012021), we get a palindrome (2404114042).

Subtracting from 1202102021 its reverse (1202012021), we obtain a square (90000 = 300²).

The spelling of 1202102021 in words is "one billion, two hundred two million, one hundred two thousand, twenty-one".