21361948370 has 48 divisors (see below), whose sum is σ = 44835982488. Its totient is φ = 7306629120.

The previous prime is 21361948367. The next prime is 21361948373. The reversal of 21361948370 is 7384916312.

It is an interprime number because it is at equal distance from previous prime (21361948367) and next prime (21361948373).

It can be written as a sum of positive squares in 4 ways, for example, as 2880361561 + 18481586809 = 53669^2 + 135947^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21361948373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154514 + ... + 258066.

Almost surely, 2^21361948370 is an apocalyptic number.

21361948370 is an abundant number, since it is smaller than the sum of its proper divisors (23474034118).

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

21361948370 is a wasteful number, since it uses less digits than its factorization.

21361948370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103995 (or 103988 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 21361948370 in words is "twenty-one billion, three hundred sixty-one million, nine hundred forty-eight thousand, three hundred seventy".