2021664142734 has 16 divisors (see below), whose sum is σ = 4182753399120. Its totient is φ = 650650528640.

The previous prime is 2021664142721. The next prime is 2021664142741. The reversal of 2021664142734 is 4372414661202.

It is a happy number.

It is a super-3 number, since 3×2021664142734³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5809379547 + ... + 5809379894.

It is an arithmetic number, because the mean of its divisors is an integer number (261422087445).

Almost surely, 2^{2021664142734} is an apocalyptic number.

2021664142734 is an abundant number, since it is smaller than the sum of its proper divisors (2161089256386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021664142734 is a wasteful number, since it uses less digits than its factorization.

2021664142734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11618759475.

The product of its (nonzero) digits is 387072, while the sum is 42.

The spelling of 2021664142734 in words is "two trillion, twenty-one billion, six hundred sixty-four million, one hundred forty-two thousand, seven hundred thirty-four".