21019017037 has 2 divisors, whose sum is σ = 21019017038. Its totient is φ = 21019017036.

The previous prime is 21019017001. The next prime is 21019017043. The reversal of 21019017037 is 73071091012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18841954756 + 2177062281 = 137266^2 + 46659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21019017037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21019017067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10509508518 + 10509508519.

It is an arithmetic number, because the mean of its divisors is an integer number (10509508519).

Almost surely, 2^21019017037 is an apocalyptic number.

It is an amenable number.

21019017037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21019017037 is an equidigital number, since it uses as much as digits as its factorization.

21019017037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2646, while the sum is 31.

The spelling of 21019017037 in words is "twenty-one billion, nineteen million, seventeen thousand, thirty-seven".