21357534037441 has 16 divisors (see below), whose sum is σ = 24752003465088. Its totient is φ = 18049095907200.

The previous prime is 21357534037439. The next prime is 21357534037459. The reversal of 21357534037441 is 14473043575312.

It is a cyclic number.

It is not a de Polignac number, because 21357534037441 - 2¹ = 21357534037439 is a prime.

It is a super-2 number, since 2×21357534037441² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21357534037241) 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, 6223495 + ... + 9024796.

It is an arithmetic number, because the mean of its divisors is an integer number (1547000216568).

Almost surely, 2^{21357534037441} is an apocalyptic number.

It is an amenable number.

21357534037441 is a deficient number, since it is larger than the sum of its proper divisors (3394469427647).

21357534037441 is a wasteful number, since it uses less digits than its factorization.

21357534037441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15251112.

The product of its (nonzero) digits is 4233600, while the sum is 49.

The spelling of 21357534037441 in words is "twenty-one trillion, three hundred fifty-seven billion, five hundred thirty-four million, thirty-seven thousand, four hundred forty-one".