21262521701 has 2 divisors, whose sum is σ = 21262521702. Its totient is φ = 21262521700.

The previous prime is 21262521677. The next prime is 21262521751. The reversal of 21262521701 is 10712526212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20851648801 + 410872900 = 144401^2 + 20270^2 .

It is a cyclic number.

It is not a de Polignac number, because 21262521701 - 2¹⁴ = 21262505317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21262521751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10631260850 + 10631260851.

It is an arithmetic number, because the mean of its divisors is an integer number (10631260851).

Almost surely, 2^21262521701 is an apocalyptic number.

It is an amenable number.

21262521701 is a deficient number, since it is larger than the sum of its proper divisors (1).

21262521701 is an equidigital number, since it uses as much as digits as its factorization.

21262521701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The spelling of 21262521701 in words is "twenty-one billion, two hundred sixty-two million, five hundred twenty-one thousand, seven hundred one".