21097463493 has 8 divisors (see below), whose sum is σ = 28606730400. Its totient is φ = 13826586128.

The previous prime is 21097463467. The next prime is 21097463501. The reversal of 21097463493 is 39436479012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21097463493 - 2⁵ = 21097463461 is a prime.

It is a super-2 number, since 2×21097463493² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21097463423) 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, 59597178 + ... + 59597531.

It is an arithmetic number, because the mean of its divisors is an integer number (3575841300).

Almost surely, 2^21097463493 is an apocalyptic number.

It is an amenable number.

21097463493 is a deficient number, since it is larger than the sum of its proper divisors (7509266907).

21097463493 is a wasteful number, since it uses less digits than its factorization.

21097463493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119194771.

The product of its (nonzero) digits is 979776, while the sum is 48.

The spelling of 21097463493 in words is "twenty-one billion, ninety-seven million, four hundred sixty-three thousand, four hundred ninety-three".