21357533978662 has 16 divisors (see below), whose sum is σ = 36975419507232. Its totient is φ = 9062602819200.

The previous prime is 21357533978633. The next prime is 21357533978663. The reversal of 21357533978662 is 26687933575312.

It is a super-2 number, since 2×21357533978662² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21357533978663) 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, 7552167603 + ... + 7552170430.

It is an arithmetic number, because the mean of its divisors is an integer number (2310963719202).

Almost surely, 2^{21357533978662} is an apocalyptic number.

21357533978662 is a deficient number, since it is larger than the sum of its proper divisors (15617885528570).

21357533978662 is a wasteful number, since it uses less digits than its factorization.

21357533978662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15104338143.

The product of its digits is 342921600, while the sum is 67.

The spelling of 21357533978662 in words is "twenty-one trillion, three hundred fifty-seven billion, five hundred thirty-three million, nine hundred seventy-eight thousand, six hundred sixty-two".