21022000021951 has 2 divisors, whose sum is σ = 21022000021952. Its totient is φ = 21022000021950.

The previous prime is 21022000021933. The next prime is 21022000021999. The reversal of 21022000021951 is 15912000022012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21022000021951 - 2⁹ = 21022000021439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022000021151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511000010975 + 10511000010976.

It is an arithmetic number, because the mean of its divisors is an integer number (10511000010976).

Almost surely, 2^{21022000021951} is an apocalyptic number.

21022000021951 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022000021951 is an equidigital number, since it uses as much as digits as its factorization.

21022000021951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 21022000021951 its reverse (15912000022012), we get a palindrome (36934000043963).

The spelling of 21022000021951 in words is "twenty-one trillion, twenty-two billion, twenty-one thousand, nine hundred fifty-one".