21634106901 has 16 divisors (see below), whose sum is σ = 31911003648. Its totient is φ = 12926908400.

The previous prime is 21634106899. The next prime is 21634106929. The reversal of 21634106901 is 10960143612.

It is a cyclic number.

It is not a de Polignac number, because 21634106901 - 2¹ = 21634106899 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21634106101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4614411 + ... + 4619096.

It is an arithmetic number, because the mean of its divisors is an integer number (1994437728).

Almost surely, 2^21634106901 is an apocalyptic number.

It is an amenable number.

21634106901 is a deficient number, since it is larger than the sum of its proper divisors (10276896747).

21634106901 is a wasteful number, since it uses less digits than its factorization.

21634106901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9233592.

The product of its (nonzero) digits is 7776, while the sum is 33.

The spelling of 21634106901 in words is "twenty-one billion, six hundred thirty-four million, one hundred six thousand, nine hundred one".