20002000021951 has 2 divisors, whose sum is σ = 20002000021952. Its totient is φ = 20002000021950.

The previous prime is 20002000021943. The next prime is 20002000022087. The reversal of 20002000021951 is 15912000020002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20002000021951 - 2³ = 20002000021943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20002000021931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001000010975 + 10001000010976.

It is an arithmetic number, because the mean of its divisors is an integer number (10001000010976).

Almost surely, 2^{20002000021951} is an apocalyptic number.

20002000021951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002000021951 is an equidigital number, since it uses as much as digits as its factorization.

20002000021951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 20002000021951 its reverse (15912000020002), we get a palindrome (35914000041953).

The spelling of 20002000021951 in words is "twenty trillion, two billion, twenty-one thousand, nine hundred fifty-one".