1261402041621 has 8 divisors (see below), whose sum is σ = 1754994144960. Its totient is φ = 804372316352.

The previous prime is 1261402041611. The next prime is 1261402041637.

1261402041621 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1261402041621 - 2¹³ = 1261402033429 is a prime.

It is a super-2 number, since 2×1261402041621² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261402041611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9140594436 + ... + 9140594573.

It is an arithmetic number, because the mean of its divisors is an integer number (219374268120).

Almost surely, 2^{1261402041621} is an apocalyptic number.

It is an amenable number.

1261402041621 is a deficient number, since it is larger than the sum of its proper divisors (493592103339).

1261402041621 is a wasteful number, since it uses less digits than its factorization.

1261402041621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18281189035.

The product of its (nonzero) digits is 4608, while the sum is 30.

The spelling of 1261402041621 in words is "one trillion, two hundred sixty-one billion, four hundred two million, forty-one thousand, six hundred twenty-one".