21506071220676 has 144 divisors (see below), whose sum is σ = 66053102379264. Its totient is φ = 5766540519168.

The previous prime is 21506071220663. The next prime is 21506071220687. The reversal of 21506071220676 is 67602217060512.

21506071220676 is a `hidden beast` number, since 2 + 1 + 5 + 0 + 607 + 12 + 20 + 6 + 7 + 6 = 666.

It is a super-2 number, since 2×21506071220676² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34697551 + ... + 35311926.

It is an arithmetic number, because the mean of its divisors is an integer number (458702099856).

Almost surely, 2^{21506071220676} is an apocalyptic number.

It is an amenable number.

21506071220676 is an abundant number, since it is smaller than the sum of its proper divisors (44547031158588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21506071220676 is a wasteful number, since it uses less digits than its factorization.

21506071220676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70009570 (or 70009565 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 21506071220676 in words is "twenty-one trillion, five hundred six billion, seventy-one million, two hundred twenty thousand, six hundred seventy-six".