21970650601 has 2 divisors, whose sum is σ = 21970650602. Its totient is φ = 21970650600.

The previous prime is 21970650599. The next prime is 21970650649. The reversal of 21970650601 is 10605607912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11046220201 + 10924430400 = 105101^2 + 104520^2 .

It is a cyclic number.

It is not a de Polignac number, because 21970650601 - 2¹ = 21970650599 is a prime.

It is a super-2 number, since 2×21970650601² (a number of 21 digits) contains 22 as substring.

Together with 21970650599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21970650671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10985325300 + 10985325301.

It is an arithmetic number, because the mean of its divisors is an integer number (10985325301).

Almost surely, 2^21970650601 is an apocalyptic number.

It is an amenable number.

21970650601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21970650601 is an equidigital number, since it uses as much as digits as its factorization.

21970650601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 21970650601 in words is "twenty-one billion, nine hundred seventy million, six hundred fifty thousand, six hundred one".