2152621973 has 2 divisors, whose sum is σ = 2152621974. Its totient is φ = 2152621972.

The previous prime is 2152621969. The next prime is 2152621997. The reversal of 2152621973 is 3791262512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1948074769 + 204547204 = 44137^2 + 14302^2 .

It is a cyclic number.

It is not a de Polignac number, because 2152621973 - 2² = 2152621969 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2152621943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076310986 + 1076310987.

It is an arithmetic number, because the mean of its divisors is an integer number (1076310987).

Almost surely, 2^2152621973 is an apocalyptic number.

It is an amenable number.

2152621973 is a deficient number, since it is larger than the sum of its proper divisors (1).

2152621973 is an equidigital number, since it uses as much as digits as its factorization.

2152621973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 2152621973 is about 46396.3573246866. The cubic root of 2152621973 is about 1291.1873316045.

The spelling of 2152621973 in words is "two billion, one hundred fifty-two million, six hundred twenty-one thousand, nine hundred seventy-three".