21506071553476 has 48 divisors (see below), whose sum is σ = 37880581939200. Its totient is φ = 10683219492000.

The previous prime is 21506071553437. The next prime is 21506071553479. The reversal of 21506071553476 is 67435517060512.

It is a super-2 number, since 2×21506071553476² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21506071553479) 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, 1833262531 + ... + 1833274261.

It is an arithmetic number, because the mean of its divisors is an integer number (789178790400).

Almost surely, 2^{21506071553476} is an apocalyptic number.

It is an amenable number.

21506071553476 is a deficient number, since it is larger than the sum of its proper divisors (16374510385724).

21506071553476 is a wasteful number, since it uses less digits than its factorization.

21506071553476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15136 (or 15134 counting only the distinct ones).

The product of its (nonzero) digits is 5292000, while the sum is 52.

The spelling of 21506071553476 in words is "twenty-one trillion, five hundred six billion, seventy-one million, five hundred fifty-three thousand, four hundred seventy-six".