21676201261 has 8 divisors (see below), whose sum is σ = 25465747104. Its totient is φ = 18189819120.

The previous prime is 21676201241. The next prime is 21676201361. The reversal of 21676201261 is 16210267612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21676201261 - 2²⁹ = 21139330349 is a prime.

It is a super-2 number, since 2×21676201261² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676201201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75790771 + ... + 75791056.

It is an arithmetic number, because the mean of its divisors is an integer number (3183218388).

Almost surely, 2^21676201261 is an apocalyptic number.

It is an amenable number.

21676201261 is a deficient number, since it is larger than the sum of its proper divisors (3789545843).

21676201261 is a wasteful number, since it uses less digits than its factorization.

21676201261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151581851.

The product of its (nonzero) digits is 12096, while the sum is 34.

Adding to 21676201261 its reverse (16210267612), we get a palindrome (37886468873).

The spelling of 21676201261 in words is "twenty-one billion, six hundred seventy-six million, two hundred one thousand, two hundred sixty-one".