21229162681 has 8 divisors (see below), whose sum is σ = 21264244544. Its totient is φ = 21194112240.

The previous prime is 21229162597. The next prime is 21229162699. The reversal of 21229162681 is 18626192212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21229162681 - 2¹¹ = 21229160633 is a prime.

It is a super-2 number, since 2×21229162681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21229162181) 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, 1605226 + ... + 1618396.

It is an arithmetic number, because the mean of its divisors is an integer number (2658030568).

Almost surely, 2^21229162681 is an apocalyptic number.

It is an amenable number.

21229162681 is a deficient number, since it is larger than the sum of its proper divisors (35081863).

21229162681 is a wasteful number, since it uses less digits than its factorization.

21229162681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15711.

The product of its digits is 41472, while the sum is 40.

The spelling of 21229162681 in words is "twenty-one billion, two hundred twenty-nine million, one hundred sixty-two thousand, six hundred eighty-one".