21012000020147 has 2 divisors, whose sum is σ = 21012000020148. Its totient is φ = 21012000020146.

The previous prime is 21012000020107. The next prime is 21012000020149. The reversal of 21012000020147 is 74102000021012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012000020147 - 2⁶ = 21012000020083 is a prime.

Together with 21012000020149, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21012000020149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506000010073 + 10506000010074.

It is an arithmetic number, because the mean of its divisors is an integer number (10506000010074).

Almost surely, 2^{21012000020147} is an apocalyptic number.

21012000020147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012000020147 is an equidigital number, since it uses as much as digits as its factorization.

21012000020147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 21012000020147 its reverse (74102000021012), we get a palindrome (95114000041159).

The spelling of 21012000020147 in words is "twenty-one trillion, twelve billion, twenty thousand, one hundred forty-seven".