21340051061 has 8 divisors (see below), whose sum is σ = 25449005184. Its totient is φ = 17496190800.

The previous prime is 21340051021. The next prime is 21340051063. The reversal of 21340051061 is 16015004312.

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 21340051061 - 2²² = 21335856757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340051063) 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, 66273290 + ... + 66273611.

It is an arithmetic number, because the mean of its divisors is an integer number (3181125648).

Almost surely, 2^21340051061 is an apocalyptic number.

It is an amenable number.

21340051061 is a deficient number, since it is larger than the sum of its proper divisors (4108954123).

21340051061 is a wasteful number, since it uses less digits than its factorization.

21340051061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132546931.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 21340051061 its reverse (16015004312), we get a palindrome (37355055373).

The spelling of 21340051061 in words is "twenty-one billion, three hundred forty million, fifty-one thousand, sixty-one".