21393476691460 has 24 divisors (see below), whose sum is σ = 47569024644120. Its totient is φ = 8054014754304.

The previous prime is 21393476691359. The next prime is 21393476691463. The reversal of 21393476691460 is 6419667439312.

It can be written as a sum of positive squares in 4 ways, for example, as 4810468385284 + 16583008306176 = 2193278^2 + 4072224^2 .

It is not an unprimeable number, because it can be changed into a prime (21393476691463) 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, 31460994795 + ... + 31460995474.

It is an arithmetic number, because the mean of its divisors is an integer number (1982042693505).

Almost surely, 2^{21393476691460} is an apocalyptic number.

21393476691460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21393476691460 is an abundant number, since it is smaller than the sum of its proper divisors (26175547952660).

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

21393476691460 is a wasteful number, since it uses less digits than its factorization.

21393476691460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62921990295 (or 62921990293 counting only the distinct ones).

The product of its (nonzero) digits is 35271936, while the sum is 61.

The spelling of 21393476691460 in words is "twenty-one trillion, three hundred ninety-three billion, four hundred seventy-six million, six hundred ninety-one thousand, four hundred sixty".