21677042150568 has 448 divisors, whose sum is σ = 73865192526720. Its totient is φ = 5819309568000.

The previous prime is 21677042150527. The next prime is 21677042150579. The reversal of 21677042150568 is 86505124077612.

It is a happy number.

21677042150568 is a `hidden beast` number, since 2 + 1 + 6 + 7 + 7 + 0 + 4 + 21 + 50 + 568 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 417072823 + ... + 417124793.

It is an arithmetic number, because the mean of its divisors is an integer number (164877661890).

Almost surely, 2^{21677042150568} is an apocalyptic number.

21677042150568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21677042150568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36932596263360).

21677042150568 is an abundant number, since it is smaller than the sum of its proper divisors (52188150376152).

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

21677042150568 is a wasteful number, since it uses less digits than its factorization.

21677042150568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52620 (or 52601 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 54.

The spelling of 21677042150568 in words is "twenty-one trillion, six hundred seventy-seven billion, forty-two million, one hundred fifty thousand, five hundred sixty-eight".