201970246921 has 3 divisors (see below), whose sum is σ = 201970696333. Its totient is φ = 201969797510.

The previous prime is 201970246889. The next prime is 201970246931. The reversal of 201970246921 is 129642079102.

The square root of 201970246921 is 449411.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 129642079102 = 2 ⋅64821039551.

It is not a de Polignac number, because 201970246921 - 2⁵ = 201970246889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201970246931) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 224706 + ... + 674116.

Almost surely, 2^201970246921 is an apocalyptic number.

201970246921 is the 449411-st square number.

201970246921 is the 224706-th centered octagonal number.

It is an amenable number.

201970246921 is a deficient number, since it is larger than the sum of its proper divisors (449412).

201970246921 is an frugal number, since it uses more digits than its factorization.

201970246921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898822 (or 449411 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 201970246921 in words is "two hundred one billion, nine hundred seventy million, two hundred forty-six thousand, nine hundred twenty-one".