2151212501 has 2 divisors, whose sum is σ = 2151212502. Its totient is φ = 2151212500.

The previous prime is 2151212473. The next prime is 2151212551. The reversal of 2151212501 is 1052121512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1221572401 + 929640100 = 34951^2 + 30490^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151212501 - 2¹⁰ = 2151211477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151212551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075606250 + 1075606251.

It is an arithmetic number, because the mean of its divisors is an integer number (1075606251).

Almost surely, 2^2151212501 is an apocalyptic number.

It is an amenable number.

2151212501 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151212501 is an equidigital number, since it uses as much as digits as its factorization.

2151212501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 2151212501 is about 46381.1653691453. The cubic root of 2151212501 is about 1290.9054598900.

The spelling of 2151212501 in words is "two billion, one hundred fifty-one million, two hundred twelve thousand, five hundred one".