21442001953 has 2 divisors, whose sum is σ = 21442001954. Its totient is φ = 21442001952.

The previous prime is 21442001881. The next prime is 21442002007. The reversal of 21442001953 is 35910024412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14749616704 + 6692385249 = 121448^2 + 81807^2 .

It is a cyclic number.

It is not a de Polignac number, because 21442001953 - 2¹³ = 21441993761 is a prime.

It is not a weakly prime, because it can be changed into another prime (21442001153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721000976 + 10721000977.

It is an arithmetic number, because the mean of its divisors is an integer number (10721000977).

Almost surely, 2^21442001953 is an apocalyptic number.

It is an amenable number.

21442001953 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442001953 is an equidigital number, since it uses as much as digits as its factorization.

21442001953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 21442001953 in words is "twenty-one billion, four hundred forty-two million, one thousand, nine hundred fifty-three".