21261200134 has 8 divisors (see below), whose sum is σ = 31899900240. Its totient is φ = 10627900056.

The previous prime is 21261200131. The next prime is 21261200143. The reversal of 21261200134 is 43100216212.

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

It is a super-2 number, since 2×21261200134² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21261200131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1340149 + ... + 1355920.

It is an arithmetic number, because the mean of its divisors is an integer number (3987487530).

Almost surely, 2^21261200134 is an apocalyptic number.

21261200134 is a deficient number, since it is larger than the sum of its proper divisors (10638700106).

21261200134 is a wasteful number, since it uses less digits than its factorization.

21261200134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700014.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21261200134 its reverse (43100216212), we get a palindrome (64361416346).

The spelling of 21261200134 in words is "twenty-one billion, two hundred sixty-one million, two hundred thousand, one hundred thirty-four".