21250201061 has 4 divisors (see below), whose sum is σ = 21269751552. Its totient is φ = 21230650572.

The previous prime is 21250201031. The next prime is 21250201079. The reversal of 21250201061 is 16010205212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21250201061 - 2⁶ = 21250200997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250201001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9773615 + ... + 9775788.

It is an arithmetic number, because the mean of its divisors is an integer number (5317437888).

Almost surely, 2^21250201061 is an apocalyptic number.

It is an amenable number.

21250201061 is a deficient number, since it is larger than the sum of its proper divisors (19550491).

21250201061 is a wasteful number, since it uses less digits than its factorization.

21250201061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19550490.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21250201061 its reverse (16010205212), we get a palindrome (37260406273).

The spelling of 21250201061 in words is "twenty-one billion, two hundred fifty million, two hundred one thousand, sixty-one".