21070978301 has 4 divisors (see below), whose sum is σ = 21082837692. Its totient is φ = 21059118912.

The previous prime is 21070978273. The next prime is 21070978307. The reversal of 21070978301 is 10387907012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17781955801 + 3289022500 = 133349^2 + 57350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21070978301 is a prime.

It is a super-2 number, since 2×21070978301² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070978307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5927030 + ... + 5930583.

It is an arithmetic number, because the mean of its divisors is an integer number (5270709423).

Almost surely, 2^21070978301 is an apocalyptic number.

It is an amenable number.

21070978301 is a deficient number, since it is larger than the sum of its proper divisors (11859391).

21070978301 is a wasteful number, since it uses less digits than its factorization.

21070978301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11859390.

The product of its (nonzero) digits is 21168, while the sum is 38.

The spelling of 21070978301 in words is "twenty-one billion, seventy million, nine hundred seventy-eight thousand, three hundred one".