21603145471076 has 24 divisors (see below), whose sum is σ = 41133348364920. Its totient is φ = 9867891981312.

The previous prime is 21603145471031. The next prime is 21603145471079. The reversal of 21603145471076 is 67017454130612.

It can be written as a sum of positive squares in 4 ways, for example, as 621615557476 + 20981529913600 = 788426^2 + 4580560^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21603145471076.

It is not an unprimeable number, because it can be changed into a prime (21603145471079) 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, 2141464571 + ... + 2141474658.

It is an arithmetic number, because the mean of its divisors is an integer number (1713889515205).

Almost surely, 2^{21603145471076} is an apocalyptic number.

21603145471076 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21603145471076 is a deficient number, since it is larger than the sum of its proper divisors (19530202893844).

21603145471076 is a wasteful number, since it uses less digits than its factorization.

21603145471076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4282939343 (or 4282939341 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 21603145471076 in words is "twenty-one trillion, six hundred three billion, one hundred forty-five million, four hundred seventy-one thousand, seventy-six".