21025401259 has 2 divisors, whose sum is σ = 21025401260. Its totient is φ = 21025401258.

The previous prime is 21025401223. The next prime is 21025401283. The reversal of 21025401259 is 95210452012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21025401259 - 2¹⁷ = 21025270187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21025401259.

It is not a weakly prime, because it can be changed into another prime (21025404259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10512700629 + 10512700630.

It is an arithmetic number, because the mean of its divisors is an integer number (10512700630).

Almost surely, 2^21025401259 is an apocalyptic number.

21025401259 is a deficient number, since it is larger than the sum of its proper divisors (1).

21025401259 is an equidigital number, since it uses as much as digits as its factorization.

21025401259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 21025401259 in words is "twenty-one billion, twenty-five million, four hundred one thousand, two hundred fifty-nine".