10021211219821 has 2 divisors, whose sum is σ = 10021211219822. Its totient is φ = 10021211219820.

The previous prime is 10021211219737. The next prime is 10021211219843. The reversal of 10021211219821 is 12891211212001.

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., 8553694608900 + 1467516610921 = 2924670^2 + 1211411^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021211219821 - 2⁷ = 10021211219693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10021211219021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010605609910 + 5010605609911.

It is an arithmetic number, because the mean of its divisors is an integer number (5010605609911).

Almost surely, 2^{10021211219821} is an apocalyptic number.

It is an amenable number.

10021211219821 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021211219821 is an equidigital number, since it uses as much as digits as its factorization.

10021211219821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 31.

The spelling of 10021211219821 in words is "ten trillion, twenty-one billion, two hundred eleven million, two hundred nineteen thousand, eight hundred twenty-one".