21403213557474 has 32 divisors (see below), whose sum is σ = 48942546831360. Its totient is φ = 6112589393232.

The previous prime is 21403213557413. The next prime is 21403213557487. The reversal of 21403213557474 is 47475531230412.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108837274 + ... + 109033749.

It is an arithmetic number, because the mean of its divisors is an integer number (1529454588480).

Almost surely, 2^{21403213557474} is an apocalyptic number.

21403213557474 is an abundant number, since it is smaller than the sum of its proper divisors (27539333273886).

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

21403213557474 is a wasteful number, since it uses less digits than its factorization.

21403213557474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217873374.

The product of its (nonzero) digits is 2822400, while the sum is 48.

Adding to 21403213557474 its reverse (47475531230412), we get a palindrome (68878744787886).

The spelling of 21403213557474 in words is "twenty-one trillion, four hundred three billion, two hundred thirteen million, five hundred fifty-seven thousand, four hundred seventy-four".