21200018652969 has 32 divisors (see below), whose sum is σ = 30657514616064. Its totient is φ = 12953655336960.

The previous prime is 21200018652949. The next prime is 21200018652977. The reversal of 21200018652969 is 96925681000212.

It is not a de Polignac number, because 21200018652969 - 2¹² = 21200018648873 is a prime.

It is a super-2 number, since 2×21200018652969² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21200018652949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1218564 + ... + 6624570.

It is an arithmetic number, because the mean of its divisors is an integer number (958047331752).

Almost surely, 2^{21200018652969} is an apocalyptic number.

It is an amenable number.

21200018652969 is a deficient number, since it is larger than the sum of its proper divisors (9457495963095).

21200018652969 is a wasteful number, since it uses less digits than its factorization.

21200018652969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5406737.

The product of its (nonzero) digits is 933120, while the sum is 51.

The spelling of 21200018652969 in words is "twenty-one trillion, two hundred billion, eighteen million, six hundred fifty-two thousand, nine hundred sixty-nine".