6900020212121 has 8 divisors (see below), whose sum is σ = 6905938753800. Its totient is φ = 6894104194432.

The previous prime is 6900020212073. The next prime is 6900020212133. The reversal of 6900020212121 is 1212120200096.

It can be written as a sum of positive squares in 4 ways, for example, as 2839009324096 + 4061010888025 = 1684936^2 + 2015195^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6900020212121 is a prime.

It is a super-2 number, since 2×6900020212121² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6900020212721) 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, 4859351 + ... + 6116643.

It is an arithmetic number, because the mean of its divisors is an integer number (863242344225).

Almost surely, 2^{6900020212121} is an apocalyptic number.

It is an amenable number.

6900020212121 is a deficient number, since it is larger than the sum of its proper divisors (5918541679).

6900020212121 is a wasteful number, since it uses less digits than its factorization.

6900020212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261995.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 6900020212121 in words is "six trillion, nine hundred billion, twenty million, two hundred twelve thousand, one hundred twenty-one".