20101058921 has 2 divisors, whose sum is σ = 20101058922. Its totient is φ = 20101058920.

The previous prime is 20101058917. The next prime is 20101058947. The reversal of 20101058921 is 12985010102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19587402025 + 513656896 = 139955^2 + 22664^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101058921 - 2² = 20101058917 is a prime.

It is not a weakly prime, because it can be changed into another prime (20101058951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050529460 + 10050529461.

It is an arithmetic number, because the mean of its divisors is an integer number (10050529461).

Almost surely, 2^20101058921 is an apocalyptic number.

It is an amenable number.

20101058921 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101058921 is an equidigital number, since it uses as much as digits as its factorization.

20101058921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

The spelling of 20101058921 in words is "twenty billion, one hundred one million, fifty-eight thousand, nine hundred twenty-one".