1299996621 has 40 divisors (see below), whose sum is σ = 2421169344. Its totient is φ = 675319680.

The previous prime is 1299996583. The next prime is 1299996631. The reversal of 1299996621 is 1266999921.

1299996621 is a `hidden beast` number, since 1 + 2 + 9 + 9 + 9 + 9 + 6 + 621 = 666.

It is not a de Polignac number, because 1299996621 - 2¹³ = 1299988429 is a prime.

It is a super-2 number, since 2×1299996621² = 3379982429222835282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299996631) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 97980 + ... + 110453.

Almost surely, 2^1299996621 is an apocalyptic number.

1299996621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1299996621 is a deficient number, since it is larger than the sum of its proper divisors (1121172723).

1299996621 is a wasteful number, since it uses less digits than its factorization.

1299996621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208463 (or 208454 counting only the distinct ones).

The product of its digits is 944784, while the sum is 54.

The square root of 1299996621 is about 36055.4658963104. The cubic root of 1299996621 is about 1091.3919374663.

The spelling of 1299996621 in words is "one billion, two hundred ninety-nine million, nine hundred ninety-six thousand, six hundred twenty-one".