20210400901 has 2 divisors, whose sum is σ = 20210400902. Its totient is φ = 20210400900.

The previous prime is 20210400877. The next prime is 20210400929. The reversal of 20210400901 is 10900401202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19030478401 + 1179922500 = 137951^2 + 34350^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210400901 - 2⁵ = 20210400869 is a prime.

It is a super-2 number, since 2×20210400901² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210401901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105200450 + 10105200451.

It is an arithmetic number, because the mean of its divisors is an integer number (10105200451).

Almost surely, 2^20210400901 is an apocalyptic number.

It is an amenable number.

20210400901 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210400901 is an equidigital number, since it uses as much as digits as its factorization.

20210400901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The spelling of 20210400901 in words is "twenty billion, two hundred ten million, four hundred thousand, nine hundred one".