61002121211 has 2 divisors, whose sum is σ = 61002121212. Its totient is φ = 61002121210.

The previous prime is 61002121189. The next prime is 61002121217. The reversal of 61002121211 is 11212120016.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61002121211 is a prime.

It is a super-2 number, since 2×61002121211² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61002121211.

It is not a weakly prime, because it can be changed into another prime (61002121217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30501060605 + 30501060606.

It is an arithmetic number, because the mean of its divisors is an integer number (30501060606).

Almost surely, 2^61002121211 is an apocalyptic number.

61002121211 is a deficient number, since it is larger than the sum of its proper divisors (1).

61002121211 is an equidigital number, since it uses as much as digits as its factorization.

61002121211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 61002121211 its reverse (11212120016), we get a palindrome (72214241227).

The spelling of 61002121211 in words is "sixty-one billion, two million, one hundred twenty-one thousand, two hundred eleven".