1214156621 has 2 divisors, whose sum is σ = 1214156622. Its totient is φ = 1214156620.

The previous prime is 1214156617. The next prime is 1214156623. The reversal of 1214156621 is 1266514121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 666362596 + 547794025 = 25814^2 + 23405^2 .

It is an emirp because it is prime and its reverse (1266514121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1214156621 - 2² = 1214156617 is a prime.

Together with 1214156623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1214156623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607078310 + 607078311.

It is an arithmetic number, because the mean of its divisors is an integer number (607078311).

Almost surely, 2^1214156621 is an apocalyptic number.

It is an amenable number.

1214156621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1214156621 is an equidigital number, since it uses as much as digits as its factorization.

1214156621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 1214156621 is about 34844.7502645664. The cubic root of 1214156621 is about 1066.8210363280.

The spelling of 1214156621 in words is "one billion, two hundred fourteen million, one hundred fifty-six thousand, six hundred twenty-one".