21310201078 has 4 divisors (see below), whose sum is σ = 31965301620. Its totient is φ = 10655100538.

The previous prime is 21310201057. The next prime is 21310201079. The reversal of 21310201078 is 87010201312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310201079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5327550268 + ... + 5327550271.

It is an arithmetic number, because the mean of its divisors is an integer number (7991325405).

Almost surely, 2^21310201078 is an apocalyptic number.

21310201078 is a deficient number, since it is larger than the sum of its proper divisors (10655100542).

21310201078 is a wasteful number, since it uses less digits than its factorization.

21310201078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10655100541.

The product of its (nonzero) digits is 672, while the sum is 25.

The spelling of 21310201078 in words is "twenty-one billion, three hundred ten million, two hundred one thousand, seventy-eight".