21420314024251 has 2 divisors, whose sum is σ = 21420314024252. Its totient is φ = 21420314024250.

The previous prime is 21420314024227. The next prime is 21420314024297. The reversal of 21420314024251 is 15242041302412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21420314024251 - 2³³ = 21411724089659 is a prime.

It is a super-2 number, since 2×21420314024251² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21420314028251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710157012125 + 10710157012126.

It is an arithmetic number, because the mean of its divisors is an integer number (10710157012126).

Almost surely, 2^{21420314024251} is an apocalyptic number.

21420314024251 is a deficient number, since it is larger than the sum of its proper divisors (1).

21420314024251 is an equidigital number, since it uses as much as digits as its factorization.

21420314024251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 31.

Adding to 21420314024251 its reverse (15242041302412), we get a palindrome (36662355326663).

The spelling of 21420314024251 in words is "twenty-one trillion, four hundred twenty billion, three hundred fourteen million, twenty-four thousand, two hundred fifty-one".