621213407 has 2 divisors, whose sum is σ = 621213408. Its totient is φ = 621213406.

The previous prime is 621213403. The next prime is 621213469. The reversal of 621213407 is 704312126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621213407 - 2² = 621213403 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621213401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310606703 + 310606704.

It is an arithmetic number, because the mean of its divisors is an integer number (310606704).

Almost surely, 2^621213407 is an apocalyptic number.

621213407 is a deficient number, since it is larger than the sum of its proper divisors (1).

621213407 is an equidigital number, since it uses as much as digits as its factorization.

621213407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 621213407 is about 24924.1530849094. The cubic root of 621213407 is about 853.2578124117.

The spelling of 621213407 in words is "six hundred twenty-one million, two hundred thirteen thousand, four hundred seven".