1242134621 has 24 divisors (see below), whose sum is σ = 1541908224. Its totient is φ = 979767360.

The previous prime is 1242134599. The next prime is 1242134623. The reversal of 1242134621 is 1264312421.

It is not a de Polignac number, because 1242134621 - 2¹⁴ = 1242118237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242134623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 432731 + ... + 435591.

It is an arithmetic number, because the mean of its divisors is an integer number (64246176).

Almost surely, 2^1242134621 is an apocalyptic number.

It is an amenable number.

1242134621 is a deficient number, since it is larger than the sum of its proper divisors (299773603).

1242134621 is a wasteful number, since it uses less digits than its factorization.

1242134621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261 (or 3248 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 1242134621 is about 35243.9302717503. The cubic root of 1242134621 is about 1074.9531967364.

The spelling of 1242134621 in words is "one billion, two hundred forty-two million, one hundred thirty-four thousand, six hundred twenty-one".